finish 8

src/8/index.ts

@@ -0,0 +1,80 @@
+import fs from "fs"
+
+const content = fs.readFileSync('input.txt', 'utf-8');
+const rows = content.split("\r\n")
+const field = rows.map(row => row.split(""))
+const antinodes = structuredClone(field);
+for (let y = 0; y < field.length; y++) {
+    for (let x = 0; x < field[y].length; x++) {
+        function inBounds(v1:number,v2:number) {
+            return ((v1 >= 0 && v1 < field[y].length) && (v2 >=0 && v2 < field.length))
+        }
+        if (field[y][x] === ".") {
+            continue;
+        } else {
+            const antennaA = field[y][x]
+            for (let y2 = 0; y2 < field.length; y2++) {
+                for (let x2 = 0; x2 < field[y2].length; x2++) {
+                    if (field[y2][x2] !== antennaA) {
+                        continue;
+                    }
+                    if (y !== y2 && x !== x2) {
+                        const antennaB = field[y2][x2]
+                        const posA = {x: x-x2,y: y-y2}
+                        const posB = {x: x2-x, y: y2-y}
+                        const placeA = {x:x + posA.x, y: y + posA.y}
+                        const placeB = {x:x2 + posB.x, y: y2 + posB.y}
+                        if (inBounds(placeA.x,placeA.y)) {
+                            antinodes[placeA.y][placeA.x] = '#'
+                        }
+                        if (inBounds(placeB.x,placeB.y)) {
+                            antinodes[placeB.y][placeB.x] = '#'
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+let count = 0;
+antinodes.forEach(row => row.forEach(char => char === '#' ? count++ : count))
+console.log(count)
+for (let y = 0; y < field.length; y++) {
+    for (let x = 0; x < field[y].length; x++) {
+        function inBounds(v1:number,v2:number) {
+            return ((v1 >= 0 && v1 < field[y].length) && (v2 >=0 && v2 < field.length))
+        }
+        if (field[y][x] === ".") {
+            continue;
+        } else {
+            const antennaA = field[y][x]
+            for (let y2 = 0; y2 < field.length; y2++) {
+                for (let x2 = 0; x2 < field[y2].length; x2++) {
+                    if (field[y2][x2] !== antennaA) {
+                        continue;
+                    }
+                    if (y !== y2 && x !== x2) {
+                        const antennaB = field[y2][x2]
+                        const posA = {x: x-x2,y: y-y2}
+                        const posB = {x: x2-x, y: y2-y}
+                        let placeA = {x:x + posA.x, y: y + posA.y}
+                        let placeB = {x:x2 + posB.x, y: y2 + posB.y}
+                        antinodes[y][x] = '#'
+                        antinodes[y2][x2] = '#'
+                        while (inBounds(placeA.x,placeA.y)) {
+                            antinodes[placeA.y][placeA.x] = '#'
+                            placeA = {x:placeA.x + posA.x, y: placeA.y + posA.y}
+                        }
+                        if (inBounds(placeB.x,placeB.y)) {
+                            antinodes[placeB.y][placeB.x] = '#'
+                            placeB = {x:placeB.x + posB.x, y: placeB.y + posB.y}
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
+count = 0;
+antinodes.forEach(row => row.forEach(char => char === '#' ? count++ : count))
+console.log(count)