80차 1번 문제풀이이

live7/test80/문제1/황장현.js

@@ -0,0 +1,40 @@
+const input = require('fs')
+  .readFileSync(process.platform === 'linux' ? '/dev/stdin' : './input.txt')
+  .toString()
+  .trim()
+  .split('\n')
+  .map((el) => el.split(' ').map(Number));
+
+function solution(input) {
+  const [N, K] = input[0];
+
+  const visited = Array(100001).fill(false);
+
+  if (N >= K) {
+    return N - K;
+  }
+
+  const queue = [[N, 0]];
+  visited[N] = true;
+
+  while (queue.length) {
+    const [X, time] = queue.shift();
+
+    if (X === K) return time;
+
+    if (X * 2 <= 100000 && !visited[X * 2]) {
+      visited[X * 2] = true;
+      queue.push([X * 2, time]);
+    }
+    if (X - 1 >= 0 && !visited[X - 1]) {
+      visited[X - 1] = true;
+      queue.push([X - 1, time + 1]);
+    }
+    if (X + 1 <= 100000 && !visited[X + 1]) {
+      visited[X + 1] = true;
+      queue.push([X + 1, time + 1]);
+    }
+  }
+}
+
+console.log(solution(input));