Feat: 골드4 사회망 서비스

Author: ienrum

4주차/채수혁/골드4__사회망_서비스(SNS).js

@@ -0,0 +1,49 @@
+const local_input = `
+8
+1 2
+1 3
+1 4
+2 5
+2 6
+4 7
+4 8
+`;
+
+const input = process.execArgv.includes("--stack-size=65536")
+  ? require("fs").readFileSync("dev/stdin").toString()
+  : local_input;
+const inputs = input
+  .trim()
+  .split("\n")
+  .slice(1)
+  .map((v) => v.split(" ").map((v2) => Number(v2)));
+
+const n = Number(input.trim().split("\n")[0]);
+const dp = Array.from({ length: n + 1 }, () =>
+  Array.from({ length: 2 }, () => 0)
+);
+
+const map = {};
+const visited = Array.from({ length: n + 1 }, () => false);
+inputs.forEach((v) => {
+  if (map[v[0]]) map[v[0]].push(v[1]);
+  else map[v[0]] = [v[1]];
+  if (map[v[1]]) map[v[1]].push(v[0]);
+  else map[v[1]] = [v[0]];
+});
+
+const dfs = (cur) => {
+  visited[cur] = true;
+  dp[cur][0] = 0;
+  dp[cur][1] = 1;
+
+  for (const node of map[cur]) {
+    if (visited[node]) continue;
+    dfs(node);
+    dp[cur][0] += dp[node][1];
+    dp[cur][1] += Math.min(dp[node][0], dp[node][1]);
+  }
+};
+
+dfs(1);
+console.log(Math.min(dp[1][0], dp[1][1]));