advent-of-code

commit 9983339ef40f385a54274bf728c7a302066f39a5
parent 9686014fd23301fdacd9c599d1fa545e5c800374
Author: finwo <finwo@pm.me>
Date:   Thu,  1 Dec 2022 11:43:26 +0100

2015/05 solution

Diffstat:
A
2015/day-05/index.js
 | 
94
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

1 file changed, 94 insertions(+), 0 deletions(-)
diff --git a/2015/day-05/index.js b/2015/day-05/index.js
@@ -0,0 +1,94 @@
+const fs = require('fs');
+const through = require('through2');
+const line_for_line = require('../common/line-for-line');
+
+let remainder = 0;
+
+fs.createReadStream('input')
+  .pipe(line_for_line())
+
+  // Convert to string
+  .pipe(through(function(line, enc, cb) {
+    this.push(line.toString());
+    cb();
+  }))
+
+  // // Bad if invalid combinations are found
+  // .pipe(through(function(line, enc, cb) {
+  //   line = line.toString();
+  //   const badStrings = [
+  //     'ab',
+  //     'cd',
+  //     'pq',
+  //     'xy',
+  //   ];
+  //   for(const badString of badStrings) {
+  //     if (~line.indexOf(badString)) {
+  //       return cb();
+  //     }
+  //   }
+  //   this.push(line);
+  //   cb()
+  // }))
+
+  // // Containing less than 3 vowels = not nice
+  // .pipe(through(function(line, enc, cb) {
+  //   line = line.toString();
+  //   const vowels = (line.match(/[aeiou]/g) || []).length;
+  //   if (vowels < 3) {
+  //     return cb();
+  //   }
+  //   this.push(line);
+  //   cb();
+  // }))
+
+  // // Must have 2 of the same characters in a row
+  // .pipe(through(function(line, enc, cb) {
+  //   line = line.toString();
+  //   const matches = (line.match(/([a-z])\1+/g) || []).length;
+  //   if (!matches) {
+  //     return cb();
+  //   }
+  //   this.push(line);
+  //   cb();
+  // }))
+
+  // Must match ?.?, where ? is the same
+  .pipe(through(function(line, enc, cb) {
+    line = line.toString();
+    const matches = (line.match(/([a-z]).\1/g) || []).length;
+    if (!matches) {
+      return cb();
+    }
+    this.push(line);
+    cb();
+  }))
+
+  // Must have non-overlapping character pair
+  .pipe(through(function(line, enc, cb) {
+    line = line.toString();
+    let matched = false;
+    for(let i=0; i<(line.length-1); i++) {
+      const set = line.substr(i, 2);
+      const idx = line.indexOf(set);
+      if ((idx >= 0) && (idx < (i-1))) {
+        matched = true;
+        break;
+      }
+    }
+    if (!matched) {
+      return cb();
+    }
+    this.push(line);
+    cb();
+  }))
+
+  .pipe(through(function(line, enc, cb) {
+    remainder++;
+    this.push(line);
+    cb();
+  }))
+
+  .on('finish', () => {
+    console.log('finished', remainder);
+  })