8-연결-요소의-개수

2022/graph-traversal/8-연결 요소의 개수/app.js

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+const fs = require("fs");
+const filePath = process.platform === "linux" ? "/dev/stdin" : "./input.txt";
+let input = fs.readFileSync(filePath).toString().trim().split("\n");
+
+// 정점의 개수, 간선의 개수
+const [N, M] = input.shift().split(" ").map(Number);
+const edges = input.map((str) => str.split(" ").map(Number));
+
+const graph = new Map();
+Array.from({ length: N }, (_, i) => graph.set(i + 1, []));
+
+edges.forEach((edge) => {
+  const [u, v] = edge;
+
+  graph.get(u).push(v);
+  graph.get(v).push(u);
+});
+
+let cnt = 0;
+const visited = new Set();
+
+const DFS = (current) => {
+  visited.add(current);
+
+  // i ~ next의 개수만큼
+  for (let i = 0; i < graph.get(current).length; i++) {
+    const next = graph.get(current)[i];
+
+    if (!visited.has(next)) {
+      DFS(next);
+    }
+  }
+};
+
+for (let i = 1; i <= N; i++) {
+  if (!visited.has(i)) {
+    DFS(i);
+    cnt++;
+  }
+}
+
+console.log(cnt);
+
+// 출처: https://kscodebase.tistory.com/395

2022/graph-traversal/8-연결 요소의 개수/input.txt

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+6 5
+1 2
+2 5
+5 1
+3 4
+4 6