diff --git a/_sungyoon/12784.cpp b/_sungyoon/12784.cpp
new file mode 100644
index 00000000..b21e8e5a
--- /dev/null
+++ b/_sungyoon/12784.cpp
@@ -0,0 +1,74 @@
+#include <bits/stdc++.h>
+using namespace std;
+typedef pair<int, int> pii;
+typedef long long ll;
+#define endl "\n"
+
+struct Tree {
+    int Node, left, right;
+};
+
+const int INF = 1e9;
+const int MAX = 1001;
+const int MOD = 1e9 + 7;
+int dx[] = {0, 0, 1, -1};
+int dy[] = {1, -1, 0, 0};
+int T, N, M;
+int dp[MAX];
+
+int func(int node, int par, vector<vector<pii>> &v) {
+    int &ret = dp[node];
+
+    if(ret != -1) return ret;
+
+    ret = 0;
+
+    bool isleaf = false;
+
+    for(auto &it : v[node]) {
+        int nextnode = it.first;
+        int cost = it.second;
+
+        if(par != nextnode) {
+            isleaf = true;
+            ret += min(func(nextnode, node, v), cost);
+        }
+    }
+
+    return ((isleaf)? ret : INF);
+}
+
+void solve(vector<vector<pii>> &v) {
+    if(N == 1) {
+        cout << 0 << endl;
+    }
+    else cout << func(1, 0, v) << endl;
+}
+
+void input() {
+    cin >> T;
+
+    while(T--) {
+        cin >> N >> M;
+
+        vector<vector<pii>> v(N+1);
+
+        memset(dp, -1, sizeof(dp));
+
+        for(int i = 0; i < M; i++) {
+            int a, b, c;
+            cin >> a >> b >> c;
+            v[a].push_back({b, c});
+            v[b].push_back({a, c});
+        }
+
+        solve(v);
+    }
+}
+
+int main() {
+    ios::sync_with_stdio(0);
+    cin.tie(0), cout.tie(0);
+
+    input();
+}