add Day5 Part 2

Day5/Vents.ts

@@ -61,7 +61,75 @@ async function Part1() {
 }
 
 async function Part2() {
+    const file = await Deno.open("./Day5/input.txt");
+    const lines = readLines(file);
 
+    let maxX = 0;
+    let maxY = 0;
+
+    const Vents: Vent[] = [];
+
+    for await (const line of lines) {
+        const [Start,End] = line.split(" -> ");
+        const [xFrom,yFrom] = Start.split(",");
+        const [xEnd,yEnd] = End.split(",");
+        maxX = Math.max(+xFrom,+xEnd,maxX);
+        maxY = Math.max(+yFrom,+yEnd,+maxY);
+        const vent = {xFrom: +xFrom, yFrom: +yFrom, xTo: +xEnd, yTo: +yEnd};
+        Vents.push(vent);
+    }
+
+    const field: number[][] = new Array(maxX+1).fill([]);
+    for (const i in field) {
+        field[i] = new Array(maxY + 1);
+        field[i].fill(0);
+    }
+
+    for (const v of Vents) {
+        if (v.xFrom == v.xTo) {
+            for (let i = Math.min(v.yFrom,v.yTo); i <= Math.max(v.yTo,v.yFrom); i++) {
+                field[v.xFrom][i]++;
+            }
+        } else if (v.yFrom == v.yTo) {
+            for (let i = Math.min(v.xFrom,v.xTo); i <= Math.max(v.xTo,v.xFrom); i++) {
+                field[i][v.yFrom]++;
+            }
+        } else {
+            if (v.xFrom < v.xTo) {
+                if (v.yFrom < v.yTo) {
+                    for (let i = 0; i <= v.xTo - v.xFrom; i++) {
+                        field[v.xFrom + i][v.yFrom + i]++;
+                    }
+                } else {
+                    for (let i = 0; i <= v.xTo - v.xFrom; i++) {
+                        field[v.xFrom + i][v.yFrom - i]++;
+                    }
+                }
+            } else {
+                if (v.yFrom < v.yTo) {
+                    for (let i = 0; i <= v.xFrom - v.xTo; i++) {
+                        field[v.xFrom - i][v.yFrom + i]++;
+                    }
+                } else {
+                    for (let i = 0; i <= v.xFrom - v.xTo; i++) {
+                        field[v.xFrom - i][v.yFrom - i]++;
+                    }
+                }
+            }
+        }
+    }
+
+    let overlap = 0;
+
+    for (const i in field) {
+        for (const j in field[i]) {
+            if (field[i][j] > 1) {
+                overlap++;
+            }
+        }
+    }
+
+    return overlap;
 }
 
 console.log("Part1: " + await Part1());