diff --git a/subway/subway.cpp b/subway/subway.cpp
index e7d7d6f..5c2e2dc 100644
--- a/subway/subway.cpp
+++ b/subway/subway.cpp
@@ -3,15 +3,15 @@ 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];
-int dline[505][505];
-priority_queue<pair<int, int>, vector<pair<int, int>>, greater<pair<int, int>>> pq;
+long long de[500505];
+long long dline[505][505];
+priority_queue<pair<long long, int>, vector<pair<long long, int>>, greater<pair<long long, 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();
+        pair<long long, int> u = pq.top();
         pq.pop();
         for(pair<int, int> v : fri[u.second]) {
             if(de[v.second] > de[u.second] + v.first) {
@@ -43,17 +43,18 @@ int main() {
             dline[i][j] = de[m + j];
         }
     }
+    // O(n log(m + n))
     while(q--) {
         int x, y;
         scanf("%d%d", &x, &y);
-        int ans = INT_MAX;
+        long long ans = LLONG_MAX;
         for(pair<int, int> i : fri[x]) {
             for(pair<int, int> j : fri[y]) {
                 ans = min(ans, dline[i.second - m][j.second - m] + i.first + j.first);
             }
         }
         // dig(x);
-        printf("%d\n", w[x] + w[y] + ans);
+        printf("%lld\n", w[x] + w[y] + ans);
     }
     return 0;
 }