87차 3번 문제풀이

Author: sangminlee98

live8/test87/문제3/이상민.js

@@ -0,0 +1,31 @@
+function validateDir(x, y, dir) {
+  switch (dir) {
+    case "U":
+      return [x, y + 1];
+    case "D":
+      return [x, y - 1];
+    case "R":
+      return [x + 1, y];
+    case "L":
+      return [x - 1, y];
+  }
+}
+
+function solution(dirs) {
+  const visited = new Set();
+  let x = 0;
+  let y = 0;
+
+  for (dir of dirs) {
+    const [nx, ny] = validateDir(x, y, dir);
+
+    if (nx >= -5 && nx <= 5 && ny >= -5 && ny <= 5) {
+      visited.add(`${x}${y}${nx}${ny}`);
+      visited.add(`${nx}${ny}${x}${y}`);
+      x = nx;
+      y = ny;
+    }
+  }
+
+  return visited.size / 2;
+}