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@@ -3387,8 +3387,8 @@ Day 12 - Subterranean Sustainability
- - ** + ** +
Stars: 50/50

Stars: 50/50

Stars: 50/50

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Stars: 22/50

+

Stars: 24/50

Stars: 0/50

Stars: 50/50

Stars: 41/50

diff --git a/puzzles/2018/day12/README.md b/puzzles/2018/day12/README.md new file mode 100644 index 0000000..bd2efb6 --- /dev/null +++ b/puzzles/2018/day12/README.md @@ -0,0 +1,10 @@ +# Advent of Code 2018 - Day 12: [Subterranean Sustainability](https://adventofcode.com/2018/day/12) + +## [Write Up](https://codingap.github.io/advent-of-code/writeups/2018/day12) + +## Results + +| | **Part 1** | **Part 2** | +| :--------------: | :--------: | :--------: | +| **Results** | 3472 | 2600000000919 | +| **Time (in ms)** | 1.14 | 14.05 | diff --git a/puzzles/2018/day12/solution.ts b/puzzles/2018/day12/solution.ts index 96980fa..9a5c833 100644 --- a/puzzles/2018/day12/solution.ts +++ b/puzzles/2018/day12/solution.ts @@ -27,39 +27,80 @@ const part1 = (input: string) => { return obj; }, {}); - for (let gen = 0; gen < 1; gen++) { - const min = Math.min(...Object.keys(state).map(num => parseInt(num))); - const max = Math.max(...Object.keys(state).map(num => parseInt(num))); + // go for 20 generations + for (let gen = 0; gen < 20; gen++) { + // find first and last plant + const min = Math.min(...Object.keys(state).filter(key => state[parseInt(key)]).map(num => parseInt(num))); + const max = Math.max(...Object.keys(state).filter(key => state[parseInt(key)]).map(num => parseInt(num))); const newState: { [key: number]: boolean } = {}; - let debug = ''; - for (let i = min; i <= max; i++) { - // let current = ''; - // for (let j = -2; j <= 2; j++) { - // if (state[i + j] === undefined) { - // state[i + j] = false; - // newState[i + j] = false; - // } - // current += state[i + j] ? '.' : '#'; - // } - - // newState[i] = rules[current] === '#'; - // debug += rules[current] ? '#' : '.'; - debug += state[i] ? '#' : '.'; + // go through all plants and find new plants from them + for (let i = min - 4; i <= max + 4; i++) { + let current = ''; + for (let j = -2; j <= 2; j++) { + if (state[i + j] === undefined) state[i + j] = false; + current += state[i + j] ? '#' : '.'; + } + + newState[i] = rules[current] === '#'; } state = newState; - console.log(debug); } - return Object.values(state).map((plant, i) => plant ? i : 0).reduce((sum, num) => sum + num, 0); + return Object.entries(state).map(([i, plant]) => plant ? parseInt(i) : 0).reduce((sum, num) => sum + num, 0); }; /** * the code of part 2 of the puzzle */ const part2 = (input: string) => { - return 0; + const [initial, transforms] = input.trim().split('\n\n'); + + // intitialize state + let state: { [key: number]: boolean } = {}; + initial.split(': ')[1].split('').forEach((char, i) => { + state[i] = char === '#'; + }); + + // parse rules + const rules = transforms.split('\n').reduce<{ [key: string]: string }>((obj, line) => { + const [left, right] = line.split(' => '); + obj[left] = right; + return obj; + }, {}); + + // a pattern emerges after a certain time where the plants gain a specific amount each time + // find the amount and extrapolate + const differences: { [key: number]: number } = {}; + let current = 0, generation = 0; + while (true) { + // find first and last plant + const min = Math.min(...Object.keys(state).filter(key => state[parseInt(key)]).map(num => parseInt(num))); + const max = Math.max(...Object.keys(state).filter(key => state[parseInt(key)]).map(num => parseInt(num))); + const newState: { [key: number]: boolean } = {}; + + // go through all plants and find new plants from them + for (let i = min - 4; i <= max + 4; i++) { + let current = ''; + for (let j = -2; j <= 2; j++) { + if (state[i + j] === undefined) state[i + j] = false; + current += state[i + j] ? '#' : '.'; + } + + newState[i] = rules[current] === '#'; + } + + const newValue = Object.entries(state).map(([i, plant]) => plant ? parseInt(i) : 0).reduce((sum, num) => sum + num, 0); + const difference = newValue - current; + differences[difference] = (differences[difference] || 0) + 1; + + if (differences[difference] >= 100) return newValue + (50000000000 - generation) * difference; + + generation++; + current = newValue; + state = newState; + } }; export { part1, part2 }; diff --git a/writeups/2015/day01/index.html b/writeups/2015/day01/index.html index 6ff8111..f19f537 100644 --- a/writeups/2015/day01/index.html +++ b/writeups/2015/day01/index.html @@ -53,206 +53,206 @@ [Back to Hub]
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diff --git a/writeups/2023/day01/index.html b/writeups/2023/day01/index.html index f9b52ba..b7d1303 100644 --- a/writeups/2023/day01/index.html +++ b/writeups/2023/day01/index.html @@ -53,206 +53,206 @@ [Back to Hub]
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diff --git a/writeups/2023/day02/index.html b/writeups/2023/day02/index.html index c055bd4..65061d0 100644 --- a/writeups/2023/day02/index.html +++ b/writeups/2023/day02/index.html @@ -53,206 +53,206 @@ [Back to Hub]
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diff --git a/writeups/2023/day03/index.html b/writeups/2023/day03/index.html index 03de613..ac19d34 100644 --- a/writeups/2023/day03/index.html +++ b/writeups/2023/day03/index.html @@ -53,206 +53,206 @@ [Back to Hub]
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diff --git a/writeups/2023/day04/index.html b/writeups/2023/day04/index.html index dce093a..f507887 100644 --- a/writeups/2023/day04/index.html +++ b/writeups/2023/day04/index.html @@ -53,206 +53,206 @@ [Back to Hub]
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diff --git a/writeups/2023/day07/index.html b/writeups/2023/day07/index.html index 4553c8d..c269587 100644 --- a/writeups/2023/day07/index.html +++ b/writeups/2023/day07/index.html @@ -53,206 +53,206 @@ [Back to Hub]
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diff --git a/writeups/2023/day08/index.html b/writeups/2023/day08/index.html index 0794584..a22b172 100644 --- a/writeups/2023/day08/index.html +++ b/writeups/2023/day08/index.html @@ -53,206 +53,206 @@ [Back to Hub]
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diff --git a/writeups/2023/day09/index.html b/writeups/2023/day09/index.html index ebaba3a..76239b3 100644 --- a/writeups/2023/day09/index.html +++ b/writeups/2023/day09/index.html @@ -53,206 +53,206 @@ [Back to Hub]
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diff --git a/writeups/2023/day10/index.html b/writeups/2023/day10/index.html index 703184c..4939d69 100644 --- a/writeups/2023/day10/index.html +++ b/writeups/2023/day10/index.html @@ -53,206 +53,206 @@ [Back to Hub]
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diff --git a/writeups/2023/day12/index.html b/writeups/2023/day12/index.html index ec103b7..bcb07fb 100644 --- a/writeups/2023/day12/index.html +++ b/writeups/2023/day12/index.html @@ -53,206 +53,206 @@ [Back to Hub]
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diff --git a/writeups/2023/day13/index.html b/writeups/2023/day13/index.html index 99b9fcf..1ef434a 100644 --- a/writeups/2023/day13/index.html +++ b/writeups/2023/day13/index.html @@ -53,206 +53,206 @@ [Back to Hub]
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diff --git a/writeups/2023/day18/index.html b/writeups/2023/day18/index.html index 7ec8164..4bea337 100644 --- a/writeups/2023/day18/index.html +++ b/writeups/2023/day18/index.html @@ -53,206 +53,206 @@ [Back to Hub]
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diff --git a/writeups/2024/day01/index.html b/writeups/2024/day01/index.html index 44c75f4..b89d431 100644 --- a/writeups/2024/day01/index.html +++ b/writeups/2024/day01/index.html @@ -53,206 +53,206 @@ [Back to Hub]
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diff --git a/writeups/2024/day02/index.html b/writeups/2024/day02/index.html index ef40b6f..e6e7dac 100644 --- a/writeups/2024/day02/index.html +++ b/writeups/2024/day02/index.html @@ -53,206 +53,206 @@ [Back to Hub]
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diff --git a/writeups/2024/day03/index.html b/writeups/2024/day03/index.html index 7a98989..57ac0d2 100644 --- a/writeups/2024/day03/index.html +++ b/writeups/2024/day03/index.html @@ -53,206 +53,206 @@ [Back to Hub]
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