developher-net · developher-net · Dec 15, 2023 · Dec 15, 2023 · Dec 15, 2023 · Dec 15, 2023
diff --git a/2023/day-02/game.js b/2023/day-02/game.js
@@ -0,0 +1,96 @@
+const parseGame = (gameString) => {
+  const data = gameString.split(':')
+  const id = parseInt(
+    data[0].match(/\d+/)[0] // find the game number
+  )
+  const draws = data[1].split(';') // split the game into draws
+    .map((draw) => {
+      const result = ['red', 'green', 'blue']
+        .map((color) => { // extract count for each color
+          const reg = new RegExp(`\\d+(?= ${color})`)
+          console.debug(reg)
+          const val = draw.match(reg) || [0]
+          console.debug(`${color} ${val}`)
+          return parseInt(val).toString(16).padStart(2, '0') // convert to hex
+        })
+
+      return result.join('') // combine into a RGB hex color string
+    })
+
+  return {
+    id,
+    draws
+  }
+}
+
+const parseHex = (hex) => {
+  return {
+    r: parseInt(hex.substring(0, 2), 16),
+    g: parseInt(hex.substring(2, 4), 16),
+    b: parseInt(hex.substring(4, 6), 16)
+  }
+}
+
+const validateDraw = (draw, limit) => {
+  const data = parseHex(draw)
+  const lim = parseHex(limit)
+  return (data.r <= lim.r && data.g <= lim.g && data.b <= lim.b)
+}
+
+const validateGame = (game, limit) => {
+  // const lim = parseHex(limit)
+  // const tally = game.draws.reduce((acc, draw) => {
+  //   const drawData = parseHex(draw)
+  //   return {
+  //     r: acc.r + drawData.r,
+  //     g: acc.g + drawData.g,
+  //     b: acc.b + drawData.b
+  //   }
+  // }, { r: 0, g: 0, b: 0 })
+
+  // const result = (tally.r <= lim.r && tally.g <= lim.g && tally.b <= lim.b)
+  // console.debug(`Game ${game.id} ${(result) ? 'passes' : 'fails'}`)
+  // if (!result) {
+  //   console.debug(tally)
+  // }
+
+  // If any draw fails, the full game fails
+  const result = game.draws.reduce((res, draw) => {
+    return (res && validateDraw(draw, limit))
+  }, true)
+  return result
+}
+
+const checksumGameSet = (games, limit) => {
+  // tally the IDs of valid games
+  return games.reduce((acc, game) => {
+    return validateGame(game, limit) ? acc + game.id : acc
+  }, 0)
+}
+
+const countCubesNeeded = (game) => {
+  const max = game.draws.reduce((acc, draw) => {
+    const drawData = parseHex(draw)
+    return {
+      r: Math.max(acc.r, drawData.r),
+      g: Math.max(acc.g, drawData.g),
+      b: Math.max(acc.b, drawData.b)
+    }
+  }, { r: 0, g: 0, b: 0 })
+
+  return max
+}
+
+const power = (game) => {
+  const needed = countCubesNeeded(game)
+  return needed.r * needed.g * needed.b
+}
+
+module.exports = {
+  parseGame,
+  validateGame,
+  checksumGameSet,
+  validateDraw,
+  countCubesNeeded,
+  power
+}
diff --git a/2023/day-02/game.test.js b/2023/day-02/game.test.js
@@ -0,0 +1,228 @@
+/* eslint-env mocha */
+const { expect } = require('chai')
+const { parseGame, validateGame, checksumGameSet, validateDraw, countCubesNeeded, power } = require('./game')
+const { linesToArray } = require('../../2018/inputParser')
+const fs = require('fs')
+const path = require('path')
+const filePath = path.join(__dirname, 'input.txt')
+
+describe('--- Day 2: Cube Conundrum ---', () => {
+  describe('Part 1', () => {
+    describe('parseGame', () => {
+      it('extracts a game string into a data object with RGB hex values for draws', () => {
+        const data = [
+          'Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green',
+          'Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue',
+          'Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red',
+          'Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red',
+          'Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green'
+        ]
+        const result = [
+          {
+            id: 1,
+            draws: [
+              '040003',
+              '010206',
+              '000200'
+            ]
+          }, {
+            id: 2,
+            draws: [
+              '000201',
+              '010304',
+              '000101'
+            ]
+          }, {
+            id: 3,
+            draws: [
+              '140806',
+              '040d05',
+              '010500'
+            ]
+          }, {
+            id: 4,
+            draws: [
+              '030106',
+              '060300',
+              '0e030f'
+            ]
+          }, {
+            id: 5,
+            draws: [
+              '060301',
+              '010202'
+            ]
+          }
+        ]
+
+        data.forEach((game, idx) => {
+          expect(parseGame(game)).to.deep.equal(result[idx])
+        })
+      })
+    })
+
+    describe('validateGame', () => {
+      it('checks if the game is valid given the limits', () => {
+        const limits = '0c0d0e' // 12 red cubes, 13 green cubes, and 14 blue cubes
+        const data = [
+          {
+            id: 1,
+            draws: [
+              '040003',
+              '010206',
+              '000200'
+            ]
+          }, {
+            id: 2,
+            draws: [
+              '000201',
+              '010304',
+              '000101'
+            ]
+          }, {
+            id: 3,
+            draws: [
+              '140806',
+              '040d05',
+              '010500'
+            ]
+          }, {
+            id: 4,
+            draws: [
+              '030106',
+              '060300',
+              '0e030f'
+            ]
+          }, {
+            id: 5,
+            draws: [
+              '060301',
+              '010202'
+            ]
+          }
+        ]
+        const result = [true, true, false, false, true]
+        data.forEach((game, idx) => {
+          expect(validateGame(game, limits)).to.equal(result[idx])
+        })
+      })
+    })
+
+    describe('checksumGameSet', () => {
+      it('tallies the IDs of valid games', () => {
+        const limits = '0c0d0e' // 12 red cubes, 13 green cubes, and 14 blue cubes
+        const data = [
+          {
+            id: 1,
+            draws: [
+              '040003',
+              '010206',
+              '000200'
+            ]
+          }, {
+            id: 2,
+            draws: [
+              '000201',
+              '010304',
+              '000101'
+            ]
+          }, {
+            id: 3,
+            draws: [
+              '140806',
+              '040d05',
+              '010500'
+            ]
+          }, {
+            id: 4,
+            draws: [
+              '030106',
+              '060300',
+              '0e030f'
+            ]
+          }, {
+            id: 5,
+            draws: [
+              '060301',
+              '010202'
+            ]
+          }
+        ]
+
+        expect(checksumGameSet(data, limits)).to.equal(8)
+      })
+    })
+
+    describe('validateDraw', () => {
+      it('validates an individual draw is within limits', () => {
+        const limit = '0c0d0e'
+        expect(validateDraw('010206', limit)).to.equal(true)
+        expect(validateDraw('060301', limit)).to.equal(true)
+        expect(validateDraw('040d05', limit)).to.equal(true)
+        expect(validateDraw('140806', limit)).to.equal(false) // game 3 draw 1 has 20 reds
+        expect(validateDraw('0e030f', limit)).to.equal(false) // game 4 draw 3 has 15 blues
+      })
+    })
+
+    describe.skip('integration test', () => {
+      let initData
+      before((done) => {
+        fs.readFile(filePath, { encoding: 'utf8' }, (err, rawData) => {
+          if (err) throw err
+          initData = linesToArray(rawData.trim()).map(parseGame)
+          // Deep copy to ensure we aren't mutating the original data
+          // data = JSON.parse(JSON.stringify(initData))
+          done()
+        })
+      })
+
+      it('result matches what we know about the answer', () => {
+        const limit = [12, 13, 14] // 12 red, 13 green, 14 blue
+          .map((num) => num.toString(16).padStart(2, '0'))
+          .join('')
+
+        expect(checksumGameSet(initData, limit)).to.be.gt(177) // 177 is too low
+        expect(checksumGameSet(initData, limit)).to.be.gt(1452) // 1452 (from creating the limit in hex wrong, and assuming cubes are not returned to the bag after each draw) is too low
+      })
+    })
+  })
+
+  describe('Part 2', () => {
+    describe('countCubesNeeded', () => {
+      it('counts how many cubes are needed for a game', () => {
+        const data = [
+          'Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green',
+          'Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue',
+          'Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red',
+          'Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red',
+          'Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green'
+        ]
+        const result = [
+          { r: 4, g: 2, b: 6 },
+          { r: 1, g: 3, b: 4 },
+          { r: 20, g: 13, b: 6 },
+          { r: 14, g: 3, b: 15 },
+          { r: 6, g: 3, b: 2 }
+        ]
+        data.forEach((game, idx) => {
+          expect(countCubesNeeded(parseGame(game))).to.deep.equal(result[idx])
+        })
+      })
+    })
+    describe('power', () => {
+      it('calculates the power for a game', () => {
+        const data = [
+          'Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green',
+          'Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue',
+          'Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red',
+          'Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red',
+          'Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green'
+        ]
+        const result = [48, 12, 1560, 630, 36]
+        data.forEach((game, idx) => {
+          expect(power(parseGame(game))).to.equal(result[idx])
+        })
+      })
+    })
+  })
+})
diff --git a/2023/day-02/index.js b/2023/day-02/index.js
@@ -0,0 +1,3 @@
+// eslint-disable-next-line no-unused-vars
+const console = require('../helpers')
+require('./solution')