solutions for day 7

07/code.js

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+const fs = require('fs');
+
+//const inputArray = fs.readFileSync('sample.txt').toString().split("\n");
+const inputArray = fs.readFileSync('input.txt').toString().split("\n");
+
+// Part One
+
+const tree = { };
+let path = [];
+
+for (i in inputArray) {
+  const command =inputArray[i].split(' ');
+  if (command[0] === '$') {
+    if (command[1] === 'cd') {
+      if (command[2] === '..') {
+        path.pop();
+      } else {
+        path.push(command[2]);
+        tree[path.join('.')] = 0;
+      }
+    }
+  } else if (command[0] !== 'dir') {
+    const size = parseInt(command[0]);
+    const dirs = [];
+    for (const dir of path) {
+      dirs.push(dir);
+      tree[dirs.join('.')] += size;
+    }
+  }
+}
+
+let summedSizes = 0;
+for (const size of Object.values(tree)) {
+  if (size <= 100000) {
+    summedSizes += size;
+  }
+}
+
+console.log(summedSizes);
+
+
+// Part Two
+
+const freeSpace = 70000000 - tree['/'];
+let candidates = [];
+
+for (const size of Object.values(tree)) {
+  if (size >= (30000000 - freeSpace)) {
+    candidates.push(size);
+  }
+}
+
+candidates.sort(function(a, b) {
+  return a - b;
+});
+
+console.log(candidates[0]);
+
+// functions
+

07/sample.txt

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+$ cd /
+$ ls
+dir a
+14848514 b.txt
+8504156 c.dat
+dir d
+$ cd a
+$ ls
+dir e
+29116 f
+2557 g
+62596 h.lst
+$ cd e
+$ ls
+584 i
+$ cd ..
+$ cd ..
+$ cd d
+$ ls
+4060174 j
+8033020 d.log
+5626152 d.ext
+7214296 k