Day 07

deno.json

@@ -30,6 +30,7 @@
     "Day03": "cd ./src/03_RucksackReorganization && deno run --allow-read=./input.txt RucksackReorganization.ts",
     "Day04": "cd ./src/04_CampCleanup && deno run --allow-read=./input.txt CampCleanup.ts",
     "Day05": "cd ./src/05_SupplyStacks && deno run --allow-read=./input.txt SupplyStacks.ts",
-    "Day06": "cd ./src/06_TuningTrouble && deno run --allow-read=./input.txt TuningTrouble.ts"
+    "Day06": "cd ./src/06_TuningTrouble && deno run --allow-read=./input.txt TuningTrouble.ts",
+    "Day07": "cd ./src/07_NoSpaceLeftOnDevice && deno run --allow-read=./input.txt NoSpaceLeftOnDevice.ts"
   }
 }

deno.lock

@@ -0,0 +1,16 @@
+{
+  "version": "2",
+  "remote": {
+    "https://deno.land/std@0.167.0/_util/asserts.ts": "d0844e9b62510f89ce1f9878b046f6a57bf88f208a10304aab50efcb48365272",
+    "https://deno.land/std@0.167.0/_util/os.ts": "8a33345f74990e627b9dfe2de9b040004b08ea5146c7c9e8fe9a29070d193934",
+    "https://deno.land/std@0.167.0/path/_constants.ts": "df1db3ffa6dd6d1252cc9617e5d72165cd2483df90e93833e13580687b6083c3",
+    "https://deno.land/std@0.167.0/path/_interface.ts": "ee3b431a336b80cf445441109d089b70d87d5e248f4f90ff906820889ecf8d09",
+    "https://deno.land/std@0.167.0/path/_util.ts": "d16be2a16e1204b65f9d0dfc54a9bc472cafe5f4a190b3c8471ec2016ccd1677",
+    "https://deno.land/std@0.167.0/path/common.ts": "bee563630abd2d97f99d83c96c2fa0cca7cee103e8cb4e7699ec4d5db7bd2633",
+    "https://deno.land/std@0.167.0/path/glob.ts": "81cc6c72be002cd546c7a22d1f263f82f63f37fe0035d9726aa96fc8f6e4afa1",
+    "https://deno.land/std@0.167.0/path/mod.ts": "cf7cec7ac11b7048bb66af8ae03513e66595c279c65cfa12bfc07d9599608b78",
+    "https://deno.land/std@0.167.0/path/posix.ts": "b859684bc4d80edfd4cad0a82371b50c716330bed51143d6dcdbe59e6278b30c",
+    "https://deno.land/std@0.167.0/path/separator.ts": "fe1816cb765a8068afb3e8f13ad272351c85cbc739af56dacfc7d93d710fe0f9",
+    "https://deno.land/std@0.167.0/path/win32.ts": "7cebd2bda6657371adc00061a1d23fdd87bcdf64b4843bb148b0b24c11b40f69"
+  }
+}

src/07_NoSpaceLeftOnDevice/NoSpaceLeftOnDevice.ts

@@ -0,0 +1,59 @@
+import { join } from 'https://deno.land/std@0.167.0/path/mod.ts';
+
+type Directory = { type: 'directory' };
+type File = { type: 'file'; size: number };
+type Tree = Record<string, Record<string, Directory | File>>;
+
+function buildTree(shellLog: string): Tree {
+  const tree: Tree = {};
+  let curPath = '';
+  for (const line of shellLog.split('\n')) {
+    if (line.startsWith('$')) {
+      if (line === '$ ls') {
+        continue;
+      }
+      curPath = join(curPath, line.split(' ').at(-1)!);
+      tree[curPath] ??= {};
+      continue;
+    }
+    if (line.startsWith('dir')) {
+      const dirName = line.split(' ').at(-1)!;
+      tree[curPath][dirName] = {
+        type: 'directory',
+      };
+      continue;
+    }
+    // only option left is file
+    const [fileSize, fileName] = line.split(' ') as [string, string];
+    tree[curPath][fileName] = {
+      type: 'file',
+      size: parseInt(fileSize),
+    };
+  }
+  return tree;
+}
+
+function duRec(tree: Tree, entryPath = '/'): Record<string, number> {
+  let result: Record<string, number> = {};
+  let curSize = 0;
+  for (const [name, entry] of Object.entries(tree[entryPath as keyof typeof tree])) {
+    if (entry.type === 'directory') {
+      const newEntry = join(entryPath, name);
+      result = Object.assign(result, duRec(tree, newEntry)) as Record<string, number>;
+      curSize += result[newEntry];
+    } else curSize += entry.size;
+  }
+  result[entryPath] = curSize;
+  return result;
+}
+
+const input = Deno.readTextFileSync('./input.txt').trimEnd();
+const tree = buildTree(input);
+const dirSizes = Object.values(duRec(tree));
+const p1 = dirSizes.filter((size) => (size <= 100000))
+  .reduce((prev, cur) => prev + cur, 0);
+console.log('Solution Part 1:', p1);
+dirSizes.sort((a, b) => a - b);
+const free = 70000000 - dirSizes.at(-1)!;
+const p2 = dirSizes.find((size) => (free + size) >= 30000000);
+console.log('Solution Part 2:', p2);