From ef1ce55cc749ed74491d8ffa63d4c85a3a4075cd Mon Sep 17 00:00:00 2001
From: sh0723 <pshpark12345@naver.com>
Date: Mon, 7 Sep 2026 17:01:16 +0900
Subject: [PATCH] =?UTF-8?q?5913=20:=20=EC=B9=9C=EA=B5=AC=EC=9D=98=20?=
 =?UTF-8?q?=EC=B9=9C=EA=B5=AC=EB=8A=94=20=EC=B9=9C=EA=B5=AC=20solve?=
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---
 src/JungOl/JO5913/JO5913_V1.cpp | 38 +++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)
 create mode 100644 src/JungOl/JO5913/JO5913_V1.cpp

diff --git a/src/JungOl/JO5913/JO5913_V1.cpp b/src/JungOl/JO5913/JO5913_V1.cpp
new file mode 100644
index 0000000..04482f0
--- /dev/null
+++ b/src/JungOl/JO5913/JO5913_V1.cpp
@@ -0,0 +1,38 @@
+#include <bits/stdc++.h>
+using namespace std;
+int used[501];
+vector<vector<int>> friends(501, vector<int>());
+int cnt = 0;
+
+void dfs(int n, int level) {
+    for (int num : friends[n]) {
+        if (level < 3 && num != 1 && used[num] == 0) {
+            cnt ++;
+            used[num] = 1;
+            dfs(num, level+1);
+        }
+    }
+}
+
+int main() {
+
+    ios_base::sync_with_stdio(false);
+    cin.tie(nullptr);
+    cout.tie(nullptr);
+
+    int N,M;
+    cin >> N >> M;
+
+
+    for (int i=0; i<M; i++) {
+        int a,b;
+        cin >> a >> b;
+        friends[a].push_back(b);
+        friends[b].push_back(a);
+    }
+
+    dfs(1,1);
+
+    cout << cnt;
+    return 0;
+}
\ No newline at end of file