Day 1 solved

2025-07-25 23:36:10 +00:00 · 2020-12-02 15:27:27 +00:00 · 2020-12-02 15:27:27 +00:00 · 93aea4f013
commit 93aea4f013
parent f3d555f01c
5 changed files with 291 additions and 1 deletions
--- a/.replit
+++ b/.replit
@ -0,0 +1,2 @@
+language = "nodejs"
+run = "npm start"
--- a/solutions/day1/input.txt
+++ b/solutions/day1/input.txt
@ -0,0 +1,200 @@
+1865
+1179
+1328
+1390
+322
+1999
+1713
+1808
+1380
+1727
+1702
+1304
+1481
+1334
+1728
+1953
+1413
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+1723
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+1532
+1918
+1490
+71
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+807
+1427
+1729
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+970
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+1500
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+1899
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+1658
+1333
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+1674
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+1620
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+1835
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+1840
+1705
+1994
+1695
+1599
+1681
+1566
+1153
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+1679
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+1910
+1786
+958
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+1583
+1914
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+1543
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+860
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--- a/solutions/day1/solution.js
+++ b/solutions/day1/solution.js
@ -0,0 +1,45 @@
+const path = require('path')
+const { read, position } = require('promise-path')
+const fromHere = position(__dirname)
+const report = (...messages) => console.log(`[${require(fromHere('../../package.json')).logName} / ${__dirname.split(path.sep).pop()}]`, ...messages)
+
+async function run () {
+  const input = (await read(fromHere('input.txt'), 'utf8')).trim().split('\n').map(x => parseInt(x, 10))
+
+  await solveForFirstStar(input)
+  await solveForSecondStar(input)
+}
+
+function findSum (array, startIndex, sum, count = 2) {
+  for (let i = 0; i < array.length; i++) {
+    const n = array[i]
+    if (count > 2) {
+      const searchResult = findSum(array, i + 1, sum - n, count - 1)
+      if (searchResult) {
+        return [n, ...searchResult]
+      }
+    } else if (count === 2) {
+      for (let j = startIndex + 1; j < array.length; j++) {
+        if (n + array[j] === sum) {
+          return [n, array[j]]
+        }
+      }
+    } else {
+      throw new Error('findSum: Invalid count')
+    }
+  }
+  return null
+}
+
+async function solveForFirstStar (input) {
+  const solution = findSum(input, 0, 2020, 2).reduce((acc, cur) => acc * cur, 1)
+  report('Input:', input)
+  report('Solution 1:', solution)
+}
+
+async function solveForSecondStar (input) {
+  const solution = findSum(input, 0, 2020, 3).reduce((acc, cur) => acc * cur, 1)
+  report('Solution 2:', solution)
+}
+
+run()
--- a/solutions/day1/viewer.html
+++ b/solutions/day1/viewer.html
@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Solution Viewer</title>
+    <style>
+      html, body { font-family: sans-serif; }
+      pre { border-radius: 0.5em; padding: 0.5em; background: #eee; }
+    </style>
+    <script src="https://cdn.jsdelivr.net/npm/axios/dist/axios.min.js"></script>
+    <script src="https://cdn.jsdelivr.net/npm/vue"></script>
+  </head>
+  <body>
+    <div id="viewer">
+      <h1>Solution Viewer ({{ solutionTitle }})</h1>
+      <p>For interesting problems; this page can be used as a dynamic viewer.</p>
+      <h3><a href="./input.txt">input.txt</a></h3>
+      <pre><code>{{ inputText }}</code></pre>
+      <h3><a href="./solution.js">solution.js</a></h3>
+      <pre><code>{{ solutionText }}</code></pre>
+    </div>
+    <script>
+const app = new Vue({
+  el: '#viewer',
+  data: () => {
+    return {
+      solutionText: '[Loading]',
+      inputText: '[Loading]'
+    }
+  },
+  computed: {
+    solutionTitle() {
+      const parts = (document.location + '').split('/')
+      return parts.reverse()[1]
+    }
+  },
+  async mounted () {
+    this.solutionText = (await axios.get('./solution.js')).data
+    this.inputText = (await axios.get('./input.txt')).data
+  }
+})
+    </script>
+  </body>
+</html>
--- a/solutions/template/solution.js
+++ b/solutions/template/solution.js
@ -12,7 +12,7 @@ async function run () {

 async function solveForFirstStar (input) {
  const solution = 'UNSOLVED'
-  report('Input:', input)
+  //  report('Input:', input);
  report('Solution 1:', solution)
 }