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4)) +(3 + 9 * 8 * 7 * 9) + 4 + 4 * 4 * (9 * 6 + (2 * 7 + 3 + 6 * 5 * 5) + 8 + 7) * (2 * (2 * 6) + 9 + (8 * 6 + 6 + 8)) +(2 + 3 * (5 + 8 * 3) * (8 + 3) + 9 * 8) + 5 \ No newline at end of file diff --git a/2020/18/part1.js b/2020/18/part1.js new file mode 100644 index 0000000..750a327 --- /dev/null +++ b/2020/18/part1.js @@ -0,0 +1,26 @@ +const fs = require('fs'); +const expressions = fs.readFileSync('./input.txt', 'utf-8').split('\n'); + +function calc (expression) { + // if it's just a number, do nothing + if (!isNaN(Number(expression))) { Number(expression) } + // if there's brackets, do that first + while (expression.match(/\(/)){ + expression = expression.replace(/\([^()]+\)/, match => + calc (match.slice(1, match.length-1)) + ) + } + // do all the calculations until it's just a number + while (isNaN(Number(expression))) { + expression = expression.replace(/(\d+) ([+*]) (\d+)/, (match, a, op, b) => + op == '+' ? parseInt(a) + parseInt(b) : parseInt(a) * parseInt(b) + ) + } + return Number(expression) +} + +let runningTotal = 0 +for (expression of expressions) { + runningTotal += calc (expression) +} +console.log(runningTotal) \ No newline at end of file diff --git a/2020/18/part2.js b/2020/18/part2.js new file mode 100644 index 0000000..633ee7c --- /dev/null +++ b/2020/18/part2.js @@ -0,0 +1,32 @@ +const fs = require('fs'); +const expressions = fs.readFileSync('./input.txt', 'utf-8').split('\n'); + +function calc (expression) { + // if it's just a number, do nothing + if (!isNaN(Number(expression))) { Number(expression) } + // if there's brackets, do that first + while (expression.match(/\(/)){ + expression = expression.replace(/\([^()]+\)/, match => + calc (match.slice(1, match.length-1)) + ) + } + // if there's addition, do that + while (expression.match(/\+/)){ + expression = expression.replace(/(\d+) \+ (\d+)/, (match, a, b) => + parseInt(a) + parseInt(b) + ) + } + // if there's multiplication, do that + while (expression.match(/\*/)) { + expression = expression.replace(/(\d+) \* (\d+)/, (match, a, b) => + parseInt(a) * parseInt(b) + ) + } + return Number(expression) +} + +let runningTotal = 0 +for (expression of expressions) { + runningTotal += calc (expression) +} +console.log(runningTotal) \ No newline at end of file diff --git a/2020/18/test1.txt b/2020/18/test1.txt new file mode 100644 index 0000000..2d85adb --- /dev/null +++ b/2020/18/test1.txt @@ -0,0 +1,6 @@ +1 + 2 * 3 + 4 * 5 + 6 +1 + (2 * 3) + (4 * (5 + 6)) +2 * 3 + (4 * 5) +5 + (8 * 3 + 9 + 3 * 4 * 3) +5 * 9 * (7 * 3 * 3 + 9 * 3 + (8 + 6 * 4)) +((2 + 4 * 9) * (6 + 9 * 8 + 6) + 6) + 2 + 4 * 2 \ No newline at end of file diff --git a/README.md b/README.md index 221b267..9c260e7 100644 --- a/README.md +++ b/README.md @@ -58,3 +58,4 @@ if (advent) { 15. [:star: :star:](https://adventofcode.com/2020/day/15 "see puzzle") 16. [:star: :star:](https://adventofcode.com/2020/day/16 "see puzzle") 17. [:star: :star:](https://adventofcode.com/2020/day/17 "see puzzle") +18. [:star: :star:](https://adventofcode.com/2020/day/18 "see puzzle")