Code

2015 Advent of Code (Python)

By telleropnul, March 31, 2023

Advent of Code is an Advent calendar of small programming puzzles for a variety of skill sets and skill levels that can be solved in any programming language you like. Go check it out: Advent of Code

Input files: adventofcode2015inputs.zip

2015 Day 25

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import numpy as np
 
data = open('input').read().replace('.','').replace(',','').split(' ')
row = int(data[-3]) # 3010
col = int(data[-1]) # 3019
 
# moving to next colum adds 2, 3, 4, ... to the value
grid = np.sum(np.arange(2, col + 1)) + 1
# moving to next row adds the column number, +1, +2 ... to the value
grid = grid + np.sum(np.arange(col, col+row-1))
 
code = 20151125
for i in range(grid - 1):
    code = code * 252533 % 33554393
print(code)

2015 Day 24 Part 02

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import itertools
from math import prod
 
data = open('input').read().splitlines()
data = [int(d) for d in data]
goal = int(sum(data) / 4)
 
quantum = []
# search for sets of 5 presents which sum to goal (none exist)
for i in range (1,10):
    for group in itertools.combinations(data, i):
        if sum(group) == goal:
            quantum.append(prod(group))
            break
#print(quantum)
print(min(quantum))

2015 Day 24 Part 01

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import itertools
from math import prod
 
data = open('input').read().splitlines()
data = [int(d) for d in data]
goal = int(sum(data) / 3)
 
quantum = []
for i in range (1,10):
    for group in itertools.combinations(data, i):
        if sum(group) == goal:
            quantum.append(prod(group))
            break
#print(quantum)
print(min(quantum))

2015 Day 23 Part 01 + 02

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data = open('input').read().splitlines()
cmds = [d.replace(',', '').split(' ') for d in data]
 
def runCmd(cmd, num, vals):
    if cmd[0] == "hlf":
        vals[cmd[1]] /= 2
        return num+1
    elif cmd[0] == "tpl":
        vals[cmd[1]] *= 3
        return num+1
    elif cmd[0] == "inc":
        vals[cmd[1]] += 1
        return num+1
    elif cmd[0] == "jmp":
        return num + int(cmd[1])
    elif cmd[0] == "jie":
        if vals[cmd[1]] % 2 == 0: return num + int(cmd[2])
        else: return num + 1
    elif cmd[0] == "jio":
        if vals[cmd[1]] == 1: return num + int(cmd[2])
        else: return num + 1
    print(cmd)
    return -1
 
vals = {"a":0, "b":0}
run = 1
while run > 0 and run <= len(cmds):
    run = runCmd(cmds[run-1], run, vals)
print(str(vals["b"]))
 
vals = {"a":1, "b":0}
run = 1
while run > 0 and run <= len(cmds):
    run = runCmd(cmds[run-1], run, vals)
print(str(vals["b"]))

2015 Day 22 Part 01 + 02

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SPELL_COSTS = {
    'magic_missle': 53,
    'drain': 73,
    'shield': 113,
    'poison': 173,
    'recharge': 229,
}
 
 
def apply_effects(game):
    if game['shield_timer']:
        game['shield_timer'] -= 1
        if game['shield_timer'] == 0:
            game['player_armor'] = 0
    if game['poison_timer']:
        game['boss_hp'] -= 3
        game['poison_timer'] -= 1
    if game['recharge_timer']:
        game['player_mana'] +=  101
        game['recharge_timer'] -= 1
 
 
def player_turn(game, spell):
    if spell == 'magic_missle':
        game['boss_hp'] -= 4
    elif spell == 'drain':
        game['boss_hp'] -= 2
        game['player_hp'] += 2
    elif spell == 'shield':
        game['shield_timer'] = 6
        game['player_armor'] += 7
    elif spell == 'poison':
        game['poison_timer'] = 6
    elif spell == 'recharge':
        game['recharge_timer'] = 5
    game['player_mana'] -= SPELL_COSTS[spell]
 
 
def boss_turn(game):
    dmg = max(game['boss_dmg'] - game['player_armor'], 1)
    game['player_hp'] -= dmg
 
 
def check_for_endgame(game, min_mana_spent):
    if game['boss_hp'] <= 0:
        min_mana_spent = min(game['mana_spent'], min_mana_spent)
        return 1, min_mana_spent
    if game['player_hp'] <= 0:
        return 2, min_mana_spent
    return 0, min_mana_spent
 
 
def find_minimal_mana(game):
    min_mana_spent = 9999999
    games = [game]
    while len(games):
        games, min_mana_spent = try_all_games(games, min_mana_spent)
    return min_mana_spent
 
 
def try_all_games(games, min_mana_spent):
    new_games = []
    for game in games:
 
        # PART B
        # game['player_hp'] = game['player_hp'] - 1
        endgame, min_mana_spent = check_for_endgame(game, min_mana_spent)
        if endgame:
            continue
 
        # apply player's turn effects
        apply_effects(game)
        endgame, min_mana_spent = check_for_endgame(game, min_mana_spent)
        if endgame:
            continue
 
        min_mana_spent = try_all_spells(game, min_mana_spent, new_games)
 
    return new_games, min_mana_spent
 
 
def try_all_spells(game, min_mana_spent, new_games):
    castable_spells = [spell for spell, cost in SPELL_COSTS.items()
                       if cost <= game['player_mana']]
    if game['shield_timer'] and 'shield' in castable_spells:
        castable_spells.remove('shield')
    if game['poison_timer'] and 'poison' in castable_spells:
        castable_spells.remove('poison')
    if game['recharge_timer'] and 'recharge' in castable_spells:
        castable_spells.remove('recharge')
 
    for spell in castable_spells:
 
        sub_game = game.copy()
        sub_game['spells_cast'] = list(sub_game['spells_cast']) + [spell]
        sub_game['mana_spent'] = sub_game['mana_spent']+SPELL_COSTS[spell]
 
        # players turn
        player_turn(sub_game, spell)
        endgame, min_mana_spent = check_for_endgame(sub_game, min_mana_spent)
        if endgame:
            continue
 
        # end early is too much mana spent
        if sub_game['mana_spent'] > min_mana_spent:
            continue
 
        # boss's turn
        apply_effects(sub_game)
        endgame, min_mana_spent = check_for_endgame(sub_game, min_mana_spent)
        if endgame:
            continue
 
        boss_turn(sub_game)
        endgame, min_mana_spent = check_for_endgame(sub_game, min_mana_spent)
        if endgame:
            continue
 
        new_games.append(sub_game)
    return min_mana_spent
 
lines = open('input').read().splitlines()
lines = [ l.split(' ') for l in lines]
 
BOSS_HIT_POINTS = int(lines[0][2]) # 58
BOSS_DAMAGE = int(lines[1][1]) # 9
 
initial_game = {
    'player_hp': 50,
    'player_mana': 500,
    'player_armor': 0,
 
    'boss_hp': BOSS_HIT_POINTS,
    'boss_dmg': BOSS_DAMAGE,
 
    'shield_timer': 0,
    'poison_timer': 0,
    'recharge_timer': 0,
 
    'spells_cast': [],
    'mana_spent': 0,
}
print(find_minimal_mana(initial_game.copy()))

2015 Day 21 Part 01 + 02

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from collections import namedtuple
 
lines = open('input').read().splitlines()
lines = [ l.split(' ') for l in lines]
 
BOSS_HIT_POINTS = lines[0][2] # 104
BOSS_DAMAGE = lines[1][1] # 8
BOSS_ARMOR = lines [2][1] # 1
 
Item = namedtuple('Item', ['name', 'cost', 'dmg', 'armor'])
 
WEAPONS = [
    Item('Dagger',        8,     4,       0),
    Item('Shortsword',   10,     5,       0),
    Item('Warhammer',    25,     6,       0),
    Item('Longsword',    40,     7,       0),
    Item('Greataxe',     74,     8,       0),
]
ARMOR = [
    Item('Nothing',       0,     0,       0),
    Item('Leather',      13,     0,       1),
    Item('Chainmail',    31,     0,       2),
    Item('Splintmail',   53,     0,       3),
    Item('Bandedmail',   75,     0,       4),
    Item('Platemail',   102,     0,       5),
]
 
RINGS = [
    Item('Nothing 1',     0,     0,       0),
    Item('Nothing 2',     0,     0,       0),
    Item('Damage +1',    25,     1,       0),
    Item('Damage +2',    50,     2,       0),
    Item('Damage +3',   100,     3,       0),
    Item('Defense +1',   20,     0,       1),
    Item('Defense +2',   40,     0,       2),
    Item('Defense +3',   80,     0,       3),
]
 
 
def does_player_win(player_hit, player_dmg, player_armor,
                    boss_hit, boss_dmg, boss_armor):
 
    boss_loss_per_turn = player_dmg - boss_armor
    if boss_loss_per_turn < 1:
        boss_loss_per_turn = 1
    player_loss_per_turn = boss_dmg - player_armor
    if player_loss_per_turn < 1:
        player_loss_per_turn = 1
 
    # the player goes first and gets n+1 turns
    n, remain = divmod(boss_hit, boss_loss_per_turn)
    if remain == 0:
        n -= 1
    if player_loss_per_turn * (n) >= player_hit:
        return False
    return True
 
 
min_cost = 999
max_cost = 0
for weapon in WEAPONS:
    for armor in ARMOR:
        for ring1 in RINGS:
            for ring2 in RINGS:
 
                # cannot own two of the same ring
                if ring1.name == ring2.name:
                    continue
 
                player_hit = 100
                player_dmg = weapon.dmg + ring1.dmg + ring2.dmg
                player_armor = armor.armor + ring1.armor + ring2.armor
                cost = weapon.cost + armor.cost + ring1.cost + ring2.cost
 
                if does_player_win(player_hit, player_dmg, player_armor,
                                   BOSS_HIT_POINTS, BOSS_DAMAGE, BOSS_ARMOR):
                    # part a, lowest cost items to win
                    min_cost = min(cost, min_cost)
                else:
                    # part b, highest cost items and still lose
                    max_cost = max(cost, max_cost)
print(min_cost)
print(max_cost)

2015 Day 20 Part 02

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import numpy as np
goal = int(open('input').read())
BIG_NUM = 1000000
houses = np.zeros(BIG_NUM)
for elf in range(1, BIG_NUM):
    houses[elf:(elf+1)*50:elf] += 11 * elf
print(np.nonzero(houses >= goal)[0][0])

2015 Day 20 Part 01

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import numpy as np
goal = int(open('input').read())
BIG_NUM = 1000000
houses = np.zeros(BIG_NUM)
for elf in range(1, BIG_NUM):
    houses[elf::elf] += 10 * elf
print(np.nonzero(houses >= goal)[0][0])

2015 Day 19 Part 02

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import re
 
lines = open('input').read().splitlines()
medicine = lines.pop()
 
# LHS, RHS sorted with largest LHS first
replacements = [(l.split()[-1], l.split()[0]) for l in lines if '=>' in l]
replacements.sort(key=lambda x: len(x[0])) # sort by string length
replacements = replacements[::-1] # reverse
 
# largest replacements on medicine first, counting steps
total = 0
while medicine != 'e':
    for lhs, rhs in replacements:
        if lhs in medicine:
            medicine = medicine.replace(lhs, rhs, 1)
            total += 1
            break
print(total)

2015 Day 19 Part 01 v2

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import re
 
lines= open('input').read().splitlines()
molecule = lines.pop()
lines.pop()
 
possibilities = set()
for l in lines:
    match, _, replace = l.split(' ')
    indices = [m.start() for m in re.finditer(match, molecule)]
    lm = len(match)
    possibilities.update( [molecule[:i] + replace + molecule[i+lm:] for i in indices] )
print(len(possibilities))

2015 Day 19 Part 01 v1

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lines = open('input').read().splitlines()
molecule = lines.pop()
lines.pop()
 
changes = {}
for l in lines:
    match, _, replace = l.split(' ')
    if match not in changes:
        changes[match] = [replace]
    else:
        changes[match].append(replace)
print(changes)
 
possibilities = set()
for i in range(len(molecule)):
    if i < len(molecule)-1 and molecule[i+1].islower():
        if molecule[i:i+2] in changes:
            for x in changes[molecule[i:i+2]]:
                possibilities.add(molecule[:i] + x + molecule[i+2:])
    else:
        if molecule[i] in changes:
            for x in changes[molecule[i]]:
                possibilities.add(molecule[:i] + x + molecule[i+1:])
print(len(possibilities))

2015 Day 18 Part 02

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# Game of life
# https://playgameoflife.com
 
lines = open('input').read().splitlines()
 
# Turning all of the corners on
lines[0] = "#" + lines[0][1:-1] + "#"
lines[-1] = "#" + lines[-1][1:-1] + "#"
 
# Running one round
def round(grid):
    next = []
    for i in range(len(grid)):
        temp  = ""
        for j in range(len(grid[i])):
            count = 0
            up = i > 0
            down = i < len(grid)-1
            left = j > 0
            right = j < len(grid[i])-1
            if up:
                if left:
                    if grid[i-1][j-1] == "#": count += 1
                if grid[i-1][j] == "#": count += 1 
                if right:
                    if grid[i-1][j+1] == "#": count += 1
            if right:
                if grid[i][j+1] == "#": count += 1
            if left:
                if grid[i][j-1] == "#": count += 1
            if down:
                if left:
                    if grid[i+1][j-1] == "#": count += 1
                if grid[i+1][j] == "#": count += 1
                if right:
                    if grid[i+1][j+1] == "#": count += 1
            if grid[i][j] == "." and count == 3: temp += "#"
            elif grid[i][j] == "#" and (count == 2 or count == 3): temp += "#"
            else: temp += "."
        next.append(temp)
    # Turning the corners on
    next[0] = "#" + next[0][1:-1] + "#"
    next[-1] = "#" + next[-1][1:-1] + "#"
    return next
 
# Running for 100 rounds
for i in range(100):
    lines = round(lines)
 
# Getting the final count
num = 0
for i in lines:
    for j in i:
        if j == "#": num += 1
 
print(num)

2015 Day 18 Part 01

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# Game of life
# https://playgameoflife.com
 
lines = open('input').read().splitlines()
 
# Running one round
def round(grid):
    next = []
    for i in range(len(grid)):
        temp  = ""
        for j in range(len(grid[i])):
            count = 0
            up = i > 0
            down = i < len(grid)-1
            left = j > 0
            right = j < len(grid[i])-1
            if up:
                if left:
                    if grid[i-1][j-1] == "#": count += 1
                if grid[i-1][j] == "#": count += 1 
                if right:
                    if grid[i-1][j+1] == "#": count += 1
            if right:
                if grid[i][j+1] == "#": count += 1
            if left:
                if grid[i][j-1] == "#": count += 1
            if down:
                if left:
                    if grid[i+1][j-1] == "#": count += 1
                if grid[i+1][j] == "#": count += 1
                if right:
                    if grid[i+1][j+1] == "#": count += 1
            if grid[i][j] == "." and count == 3: temp += "#"
            elif grid[i][j] == "#" and (count == 2 or count == 3): temp += "#"
            else: temp += "."
        next.append(temp)
    return next
 
# Running for 100 rounds
for i in range(100):
    lines = round(lines)
 
# Getting the final count
num = 0
for i in lines:
    for j in i:
        if j == "#": num += 1
 
# Printing out the final result
print("After 100 rounds,", num, "lights are on.")

2015 Day 17 Part 02

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import itertools
 
data = open('input').read().splitlines()
 
sizes = []
for d in data:
    sizes.append (int(d))
#print(sizes)
 
num = 0
min = 999
for i in range(len(sizes)): # range(0,20)
    for subset in itertools.combinations(sizes, i):
        if sum(subset) == 150:
            if len(subset) == min:
                num += 1
                continue
            elif len(subset) < min:
                num = 1
                min = len(subset)
print(num)

2015 Day 17 Part 01

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import itertools
 
data = open('input').read().splitlines()
 
sizes = []
for d in data:
    sizes.append (int(d))
#print(sizes)
 
num = 0
for i in range(len(sizes)): # range(0,20)
    for subset in itertools.combinations(sizes, i):
        if sum(subset) == 150: num += 1
print(num)

2015 Day 16 Part 02

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data = open('input').read().splitlines()
 
ticker = {
'children': 3,
'cats': 7,
'samoyeds': 2,
'pomeranians': 3,
'akitas': 0,
'vizslas': 0,
'goldfish': 5,
'trees': 3,
'cars': 2,
'perfumes': 1}
 
sues = []
for d in data:
    vals = d.replace(":", "").replace(",", "").split(" ")
    sues.append ( {"number":vals[1], 
                    vals[2]:int(vals[3]),
                    vals[4]:int(vals[5]),
                    vals[6]:int(vals[7])} )
#print(sues)
for sue in sues:
    match = True
    checks = list(sue.keys())
    checks.pop(0)
    for i in checks:
        if i in ["cats", "trees"]:
            if sue[i] <= ticker[i]: match = False ; break
        elif i in ["pomeranians", "goldfish"]:
            if sue[i] >= ticker[i]: match = False ; break
        elif sue[i] != ticker[i]: match = False ; break
    if match == True:
        print(sue)

2015 Day 16 Part 01

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data = open('input').read().splitlines()
 
ticker = {
'children': 3,
'cats': 7,
'samoyeds': 2,
'pomeranians': 3,
'akitas': 0,
'vizslas': 0,
'goldfish': 5,
'trees': 3,
'cars': 2,
'perfumes': 1}
 
sues = []
for d in data:
    vals = d.replace(":", "").replace(",", "").split(" ")
    sues.append ( {"number":vals[1], 
                    vals[2]:int(vals[3]),
                    vals[4]:int(vals[5]),
                    vals[6]:int(vals[7])} )
#print(sues)
for sue in sues:
    match = True
    checks = list(sue.keys())
    checks.pop(0)
    for i in checks:
        if sue[i] != ticker[i]:
            match = False
            break   
    if match == True:
        print(sue)

2015 Day 15 Part 01 + 02

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data = open('input').read().splitlines()
 
info = []
for d in data:
    _, _, cap, _, dur, _, flv, _, tex, _, cal = d.replace(",", "").split(" ")
    info.append ( [int(cap), int(dur),int(flv), int(tex), int(cal)] )
#print(info)
 
# The break statement is used to terminate the loop immediately
# The continue statement is used to skip the current iteration of the loop
scores = []
for i in range(100):
    for j in range(100):
        if j + i > 100:
            break
        for k in range(100):
            if j + k + i > 100: 
                break
            for l in range(100):
                if j + k + l + i > 100:
                    break
                elif j + k + l + i != 100:
                    continue
                # 500 calory requirement (part 2)
                #if info[0][4]*i + info[1][4]*j + info[2][4]*k + info[3][4]*l != 500: continue
                # Getting the scores
                cap = info[0][0]*i + info[1][0]*j + info[2][0]*k + info[3][0]*l
                dur = info[0][1]*i + info[1][1]*j + info[2][1]*k + info[3][1]*l
                flv = info[0][2]*i + info[1][2]*j + info[2][2]*k + info[3][2]*l
                tex = info[0][3]*i + info[1][3]*j + info[2][3]*k + info[3][3]*l
                if cap < 1 or dur < 1 or flv < 1 or tex < 1: break
                scores.append(cap*dur*flv*tex)
 
# Finding the highest score and returning it
scores.sort()
print(scores[-1])

2015 Day 14 Part 02

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data = open('input').read().splitlines()
 
barn = {}
for d in data:
    deer, _, _, speed, _, _, duration, _, _, _, _, _, _, rest, _ =  d.split()
    barn[deer]= (int(speed), int(duration), int(rest))
#print (barn)
 
def dist(barn,total_time):
    dist = {}
    for deer, nums in barn.items():
        speed, duration, rest = nums
        lap_time = duration + rest
        run_time, rem_time = divmod (total_time, lap_time)
        run_distance = speed * (run_time * duration)
        if rem_time > duration:
            run_distance += speed * duration
        else:
            run_distance += speed * rem_time
        dist[deer] = run_distance
    return dist
 
#total_time = 2503
#print(dist(barn,total_time))
#print(max(dist(barn, total_time).values()))
 
points = {}
for reindeer in barn:
    points[reindeer] = 0
for time in range(1, 2504):
    dists = dist(barn, time)
    max_dist = max(dists.values())
    for reindeer in barn:
        if dists[reindeer] == max_dist:
            points[reindeer] += 1
print(max(points[reindeer] for reindeer in barn))

2015 Day 14 Part 01

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data = open('input').read().splitlines()
 
barn = {}
for d in data:
    deer, _, _, speed, _, _, duration, _, _, _, _, _, _, rest, _ =  d.split()
    barn[deer] = (int(speed), int(duration), int(rest))
#print (barn)
 
total_time = 2503
dist = {}
 
for deer, nums in barn.items():
    speed, duration, rest = nums
    lap_time = duration + rest
 
    run_time = total_time // lap_time
    rem_time = total_time % lap_time
 
    run_distance = speed * (run_time * duration)
 
    if rem_time > duration:
        run_distance += speed * duration
    else:
        run_distance += speed * rem_time
 
    dist[deer] = run_distance
 
#print(dist)
print(max(dist.values()))

2015 Day 13 Part 01 + 02

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import itertools
 
happiness = {}
people = set()
 
data = open('input').read().splitlines()
data = [d.split(' ') for d in data]
 
for d in data:
    #d = d.split()
    person1 = d[0]
    direction = d[2]
    amount = int(d[3])
    person2 = d[10][:-1]
    #print(person1, direction, amount, person2)
    people.add(person1)
    people.add(person2)
    if direction == 'lose':
        happiness[person1+person2] = -amount
    else:
        assert direction == 'gain'
        happiness[person1+person2] = amount
#print(people)
#print(happiness)
 
 
def find_maximum_happiness(people, happiness):
    maximum_happiness = 0
    for arrangement in itertools.permutations(people):
        happiness_gained = 0
        for person1, person2 in zip(arrangement[:-1], arrangement[1:]):
            happiness_gained += happiness[person1 + person2]
            happiness_gained += happiness[person2 + person1]
        # add happiness for first and last pair
        person1 = arrangement[0]
        person2 = arrangement[-1]
        happiness_gained += happiness[person1 + person2]
        happiness_gained += happiness[person2 + person1]
        maximum_happiness = max(maximum_happiness, happiness_gained)
        #print(arrangement, happiness_gained)
    return maximum_happiness
 
print(find_maximum_happiness(people, happiness))
 
# part b
for person in people:
    happiness['Self' + person] = 0
    happiness[person + 'Self'] = 0
people.add('Self')
print(find_maximum_happiness(people, happiness))

2015 Day 12 Part 01 + 02

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import json
 
def sum_of_item(item, skip_red=False):
 
    if isinstance(item, list):
        return sum([sum_of_item(i, skip_red) for i in item])
 
    if isinstance(item, dict):
        if skip_red and 'red' in item.values():
            return 0
        return sum([sum_of_item(i, skip_red) for i in item.values()])
 
    if isinstance(item, str):
        return 0
 
    if isinstance(item, int):
        return item
 
with open('input') as f:
    abacus = json.load(f)
print(sum_of_item(abacus))
print(sum_of_item(abacus, skip_red=True))

2015 Day 12 Part 01

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data = open("input").read()
nums = []
curr = ''
for d in data:
    if d in "-1234567890":
        curr += d
    else:
        if len(curr) > 0:
            nums.append(int(curr))
        curr = ''
print(sum(nums))

2015 Day 11 Part 01 + 02

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data = open("input").read()
data = "hxbxwxba"
alphas = "abcdefghjkmnpqrstuvwxyz"
 
def is_valid(pwd):
 
    # i, o, l shouldn't be in the password
    forbidden = 'iol'
    for letter in forbidden:
        if letter in pwd:
            return False
 
    # increasing consecutive three letters
    condition_1 = False
    for i in range(len(pwd) - 2):
        a, b, c = pwd[i], pwd[i + 1], pwd[i + 2]
        if (alphas.index(b) - alphas.index(a)) == 1 and (alphas.index(c) - alphas.index(b)) == 1:
            condition_1 = True
            break
 
    if not condition_1: return False
 
    # Non overlapping pairs
    total_pairs = 0
    last_pair_ind = 1
    for i in range(len(pwd) - 1):
        a, b = pwd[i], pwd[i + 1]
        if a == b:
            if i == last_pair_ind:
                continue
            else:
                total_pairs += 1
                last_pair_ind = i + 1
 
    if total_pairs < 2: return False
 
    return True
 
def next_password(pwd):
    if pwd == '':
        return ''
    elif pwd[-1] == 'z':
        return next_password(pwd[:-1]) + 'a'
    else:
        return pwd[:-1] + alphas[alphas.index(pwd[-1]) + 1]
 
 
while not is_valid(data):
    data = next_password(data)
 
print(f"Part 1: {data}")
 
data = next_password(data)
 
while not is_valid(data):
    data = next_password(data)
 
print(f"Part 2: {data}")

2015 Day 10 Part 01 + 02

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from itertools import groupby
s = open("input").read()
for i in range(40):
    s = ''.join([str(len(list(g)))+k for k, g in groupby(s)])
print(len(s))
# Part Two, 10 additional application
for i in range(10):
    s = ''.join([str(len(list(g)))+k for k, g in groupby(s)])
print(len(s))

2015 Day 09 Part 01 + 02

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import itertools
 
data = open("input").read().splitlines()
data = [d.split(' ') for d in data]
 
path = {}
locations = []
 
for d in data:
    city1 = d[0]
    city2 = d[2]
    distance = int(d[4])
 
    path[city1 + city2] = distance
    path[city2 + city1] = distance
 
    locations.append(city1)
    locations.append(city2)
 
locations = set(locations)  # find unique locations
 
#print(locations)
#print(path)
 
# find shortest and longest route
shortest = 999999
longest = 0
for route in itertools.permutations(locations):
    route_length = 0
    for city1, city2 in zip(route[:-1], route[1:]):
        route_length += path[city1 + city2]
    if route_length < shortest:
        shortest = route_length
    if route_length > longest:
        longest = route_length
    #print(route, route_length)
 
print("Shortest route length:", shortest)
print("Longest route length:", longest)

2015 Day 08 Part 02

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data = open("input").read().splitlines()
code_total = 0
encode_total = 0
for d in data:
    code_total += len(d)
    encode_line = '"' + d.replace('\\', '\\\\').replace('\"', '\\\"').replace('"', '\"') + '"'
    encode_total += len(encode_line)
print(encode_total - code_total)

2015 Day 08 Part 01

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data = open("input").read().splitlines()
code_total = 0
mem_total = 0
for d in data:
    code_total += len(d)
    mem_total += len(eval(d))
print(code_total - mem_total)

2015 Day 07 Part 02

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...
tmp = solve('a')
for d in data:
    signal, wire = d.split(' -> ')
    wires[wire] = signal
wires['b']= tmp
print(solve('a'))

2015 Day 07 Part 01

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data = [
'123 -> x',
'456 -> y',
'x AND y -> d',
'x OR y -> e',
'x LSHIFT 2 -> f',
'y RSHIFT 2 -> g',
'NOT x -> h',
'NOT y -> i'
]
 
data = open("input").read().splitlines()
 
wires={}
 
AND = ' AND '
OR = ' OR '
LSHIFT = ' LSHIFT '
RSHIFT = ' RSHIFT '
NOT = 'NOT'
 
for d in data:
    signal, wire = d.split(' -> ')
    wires[wire] = signal
#print(wires)
 
def solve(wire):    
    if wire.isnumeric():
        return int(wire)
 
    signal = wires[wire]
 
    if type(signal) == int or signal.isnumeric():
        wires[wire] = int(signal)
 
    else:
        if AND in signal:
            a, b = signal.split(AND)
            wires[wire] = solve(a) & solve(b)
 
        elif OR in signal:
            a, b = signal.split(OR)
            wires[wire] = solve(a) | solve(b)
 
        elif LSHIFT in signal:
            a, b = signal.split(LSHIFT)
            wires[wire] = solve(a) << int(b)
 
        elif RSHIFT in signal:
            a, b = signal.split(RSHIFT)
            wires[wire] = solve(a) >> int(b)
 
        elif NOT in signal:
            _, a = signal.split()
            wires[wire] = ~(solve(a))
            '''
            Tilde (~n) operator is the bitwise negation operator:
            it takes the number n as binary number and “flips” all bits
            e.g. 0 to 1 and 1 to 0 to obtain the complement binary number.
            '''
 
        else:
            wires[wire] = solve(signal)
 
    return wires[wire]
 
'''
print(solve('d'))
print(solve('e'))
print(solve('f'))
print(solve('g'))
print(solve('h'))
print(solve('x'))
print(solve('y'))
'''
print(solve('a'))

2015 Day 06 Part 02

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import numpy as np
data = open("input").read().splitlines()
data = [d.split(' ') for d in data]
grid = np.zeros((1000, 1000), 'int32')
for d in data:
    # Turn on/off
    if d[0] == 'turn':
        x1, y1 = d[2].split(',')
        x2, y2 = d[4].split(',')
        x1, x2, y1, y2 = int(x1), int(x2), int(y1), int(y2)
        if d[1] == 'on':
            grid[x1:x2+1, y1:y2+1] += 1
        else:
            assert d[1] == 'off'
            grid[x1:x2+1, y1:y2+1] -= 1
            grid[grid < 0] = 0
    # Toggle
    else:
        assert d[0] == 'toggle'
        x1, y1 = d[1].split(',')
        x2, y2 = d[3].split(',')
        x1, x2, y1, y2 = int(x1), int(x2), int(y1), int(y2)
        grid[x1:x2+1, y1:y2+1] += 2
print(np.sum(grid))

2015 Day 06 Part 01

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import numpy as np
data = open("input").read().splitlines()
data = [d.split(' ') for d in data]
grid = np.zeros((1000, 1000), 'int32')
for d in data:
    # Turn on/off
    if d[0] == 'turn':
        x1, y1 = d[2].split(',')
        x2, y2 = d[4].split(',')
        x1, x2, y1, y2 = int(x1), int(x2), int(y1), int(y2)
        if d[1] == 'on':
            grid[x1:x2+1, y1:y2+1] = 1
        else:
            assert d[1] == 'off'
            grid[x1:x2+1, y1:y2+1] = 0
    # Toggle
    else:
        assert d[0] == 'toggle'
        x1, y1 = d[1].split(',')
        x2, y2 = d[3].split(',')
        x1, x2, y1, y2 = int(x1), int(x2), int(y1), int(y2)
        grid[x1:x2+1, y1:y2+1] = np.logical_not(grid[x1:x2+1, y1:y2+1])
print(np.sum(grid))

2015 Day 05 Part 02

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from re import search
data = open("input").read().splitlines()
print(sum(1 for d in data if search(r"(..).*\1", d) and search(r"(.).\1", d)))

2015 Day 05 Part 01

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from re import search
data = open("input").read().splitlines()
print(sum(1 for d in data if search("([aeiou].*){3}", d) and search(r"(.)\1", d) and not search("ab|cd|pq|xy", d)))

2015 Day 04 Part 02

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import hashlib
data = open("input").read().strip()
num = 0
while True:
    str2hash = data + str(num)
    result = hashlib.md5(str2hash.encode())
    if result.hexdigest()[0:6] == "000000":
        break
    num+=1
print(num)

2015 Day 04 Part 01

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import hashlib
data = open("input").read().strip()
num = 0
while True:
    str2hash = data + str(num)
    result = hashlib.md5(str2hash.encode())
    if result.hexdigest()[0:5] == "00000":
        break
    num+=1
print(num)

2015 Day 03 Part 02

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import numpy as np
data = open("input").read().strip()
step = {
    '^': (0, 1),
    'v': (0, -1),
    '>': (1, 0),
    '<': (-1, 0),
}
grid = np.zeros((1000, 1000), dtype='int32')
santa_x = 500
santa_y = 500
robot_x = 500
robot_y = 500
grid[santa_x, santa_y] += 1
grid[robot_x, robot_y] += 1
for i, direction in enumerate(data):
    delta_x, delta_y = step[direction]
    if (i % 2) == 0:
        santa_x += delta_x
        santa_y += delta_y
        grid[santa_x, santa_y] += 1
    else:
        robot_x += delta_x
        robot_y += delta_y
        grid[robot_x, robot_y] += 1
print("At least one present:", len(np.nonzero(grid)[0]))

2015 Day 03 Part 01

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import numpy as np
data = open("input").read().strip()
step = {
    '^': (0, 1),
    'v': (0, -1),
    '>': (1, 0),
    '<': (-1, 0),
}
grid = np.zeros((1000, 1000), dtype='int32')
x = 500
y = 500
grid[x, y] = 1
for direction in data:
    delta_x, delta_y = step[direction]
    x += delta_x
    y += delta_y
    grid[x, y] += 1
print("At least one present:", len(np.nonzero(grid)[0]))

2015 Day 02 Part 02

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data = open("input").read().splitlines()
data = [d.split('x') for d in data]
data = [list(map(int, d)) for d in data]
ribbon = 0
for d in data:
    d = sorted(d)
    ribbon += 2*d[0] + 2*d[1] + d[0]*d[1]*d[2]
print (ribbon)

2015 Day 02 Part 01

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data = open("input").read().splitlines()
data = [d.split('x') for d in data]
data = [list(map(int, d)) for d in data]
paper = 0
for d in data:
    sides = [ d[0]*d[1], d[1]*d[2], d[0]*d[2] ]
    paper += 2*sides[0] + 2*sides[1] + 2*sides[2] + min(sides)
print (paper)

2015 Day 01 Part 02

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data = open("input").read()
floor = 0
pos = 1
for d in data:
    if d == "(":
        floor+=1
    elif d == ")":
        floor-=1
    if floor < 0:
        break
    pos += 1
print (pos)

2015 Day 01 Part 01

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data = open("input").read()
floor = 0
for d in data:
    if d == "(":
        floor+=1
    elif d == ")":
        floor-=1
print (floor)