diff --git a/khj20006/202510/09 BOJ G1 Doomsday.md b/khj20006/202510/09 BOJ G1 Doomsday.md
new file mode 100644
index 00000000..96c65875
--- /dev/null
+++ b/khj20006/202510/09 BOJ G1 Doomsday.md	
@@ -0,0 +1,45 @@
+```cpp
+#include <bits/stdc++.h>
+using namespace std;
+
+int N, M, W, F, t[50000]{}, d[50000][4]{};
+vector<vector<pair<int, int>>> v(50000);
+
+int main(){
+    cin.tie(0)->sync_with_stdio(0);
+    
+    cin>>N>>M>>W>>F;
+    for(int i=1,a;i<=W;i++) {
+        cin>>a;
+        t[a] |= 1;
+    }
+    for(int i=1,a;i<=F;i++) {
+        cin>>a;
+        t[a] |= 2;
+    }
+
+    for(int a,b,c;M--;) {
+        cin>>a>>b>>c;
+        v[a].emplace_back(b,c);
+        v[b].emplace_back(a,c);
+    }
+
+    for(int i=0;i<N;i++) for(int j=0;j<4;j++) d[i][j] = 1e9;
+    d[0][t[0]] = 0;
+    priority_queue<tuple<int, int, int>, vector<tuple<int, int, int>>, greater<>> q;
+    q.emplace(0,0,t[0]);
+    while(!q.empty()) {
+        auto [s, n, k] = q.top(); q.pop();
+        if(s > d[n][k]) continue;
+        for(auto [i,c]:v[n]) {
+            int r = k | t[i];
+            if(d[i][r] > s+c) {
+                d[i][r] = s+c;
+                q.emplace(s+c,i,r);
+            }
+        }
+    }
+    cout<<d[0][3];
+
+}
+```
\ No newline at end of file