diff --git a/subway/subway.cpp b/subway/subway.cpp
index e69de29..72149c2 100644
--- a/subway/subway.cpp
+++ b/subway/subway.cpp
@@ -0,0 +1,50 @@
+#include<bits/stdc++.h>
+using namespace std;
+int c, n, m, d, q; // 25 500 5e5 20 1e5
+int w[500005];
+vector<pair<int, int>> fri[500505];
+int de[500505];
+priority_queue<pair<int, int>, vector<pair<int, int>>, greater<pair<int, int>>> pq;
+void dig(int s) {
+    memset(de, 0x7f, sizeof(de[0]) * (n + m + 1));
+    de[s] = 0;
+    pq.push({0, s});
+    while(!pq.empty()) {
+        pair<int, int> u = pq.top();
+        pq.pop();
+        for(pair<int, int> v : fri[u.second]) {
+            if(de[v.second] > de[u.second] + v.first) {
+                de[v.second] = de[u.second] + v.first;
+                pq.push({de[v.second], v.second});
+            }
+        }
+    }
+}
+int main() {
+    freopen("subway.in", "r", stdin);
+    freopen("subway.out", "w", stdout);
+    scanf("%d%d%d%d%d", &c, &n, &m, &d, &q);
+    for(int i = 1; i <= m; ++i) {
+        scanf("%d", &w[i]);
+    }
+    for(int i = 1, k; i <= n; ++i) {
+        scanf("%d", &k);
+        for(int j = 1, sta, ti; j <= k; ++j) {
+            scanf("%d%d", &sta, &ti);
+            fri[m + i].push_back({ti, sta});
+            fri[sta].push_back({ti, m + i});
+        }
+    }
+    while(q--) {
+        int x, y;
+        scanf("%d%d", &x, &y);
+        dig(x);
+        printf("%d\n", w[x] + w[y] + de[y]);
+    }
+    return 0;
+}
+/*
+g++ subway/subway.cpp -o subway/subway -std=c++14 -O2 -static -Wall && cp subway/subway ~ && chmod +x ~/subway && ~/subway
+
+500 条线路各视为图上的一个点,分别和地铁站连线
+*/
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