WIP-Day 9

Part 1 done, part 2 not working

Day 09/Part 1/index.ts

@@ -19,16 +19,18 @@ export default function runner(input: string) {
     }
 
     for (let i = 0; i < fsblk.length; i++) {
-      while(fsblk[i] === -1) fsblk[i] = fsblk.pop()??-1
+      while(fsblk[i] === -1) {
+        fsblk[i] = fsblk.pop()??-1
+        if(fsblk.length === i+1) {
+          fsblk.pop()
+          break
+        }
+      }
     }
 
-    // console.log(fsblk)
-
     let checksum = 0;
-
     fsblk.forEach((value, index) => {
       checksum += value*index
-      // console.log(`${value} * ${index} = ${value*index} (total: ${checksum}`)
     })
 
     console.log(checksum)

Day 09/Part 2/index.ts

@@ -0,0 +1,91 @@
+import fs from 'node:fs';
+
+export default function runner(input: string) {
+
+  const fsblk: number[]= []
+
+  let id = 0;
+  fs.readFile(`./${input}`, 'utf8', (err, data) => {
+    if (err) throw err;
+    for (let i = 0; i < data.length; i++) {
+      for(let j = 0; j < parseInt(data.charAt(i)); j++) {
+        if(i%2 == 0){
+          fsblk.push(id)
+        } else {
+          fsblk.push(-1)
+        }
+      }
+      if(i%2 == 0) id++;
+    }
+
+    const spaces: Map<number, number> = new Map()
+
+    let currentIndex = 0;
+    let prevSpace = false;
+
+    for (let i = 0; i < fsblk.length; i++) {
+      if(fsblk[i] === -1) {
+        if(prevSpace) {
+          spaces.set(currentIndex, (spaces.get(currentIndex)??0)+1)
+        } else {
+          currentIndex = i;
+          prevSpace = true;
+          spaces.set(i, 1)
+        }
+      } else {
+        prevSpace = false
+      }
+    }
+
+    let blocks: Map<number, number> = new Map()
+
+    prevSpace = true
+
+    for (let i = fsblk.length-1; i > -1; i--) {
+      if(fsblk[i] !== fsblk[i+1]) prevSpace = true
+      if(fsblk[i] !== -1) {
+        if(!prevSpace) {
+          blocks.set(currentIndex, (blocks.get(currentIndex)??0)+1)
+        } else {
+          currentIndex = i;
+          prevSpace = false;
+          blocks.set(currentIndex, 1)
+        }
+      }
+    }
+
+    console.log(spaces, blocks)
+
+    for(let fileId = id; fileId>-1; fileId++) {
+      const fileIndex = blocks.get(Array.from(blocks.keys())[fileId]??-1)??-1
+      const fileSize = blocks.get(fileIndex??-1)??-1
+      const freeBlockIndex = Array.from(spaces.keys())[Array.from(spaces.values()).findIndex(freeSpaceSize => freeSpaceSize>fileSize)]??-1
+
+      if(freeBlockIndex === -1) continue
+
+      console.log(freeBlockIndex)
+      console.log(fsblk)
+
+      for (let i = freeBlockIndex; i < freeBlockIndex + fileSize; i++) {
+        fsblk[i] = fileId
+      }
+      const newSpace = (spaces.get(freeBlockIndex)??0)-fileSize
+
+      spaces.delete(freeBlockIndex)
+      if(newSpace > 0) spaces.set(freeBlockIndex+fileSize, newSpace)
+
+      for (let i = 0; i < fileSize; i++) {
+        fsblk[fileIndex-1+i] = -1
+      }
+    }
+
+    let checksum = 0;
+    fsblk.forEach((value, index) => {
+      if(value === -1) return
+      checksum += value*index
+    })
+
+    console.log(checksum)
+
+  })
+}