diff --git a/subway/gen.cpp b/subway/gen.cpp
index 74dd047..433d09a 100644
--- a/subway/gen.cpp
+++ b/subway/gen.cpp
@@ -1,5 +1,33 @@
 #include<bits/stdc++.h>
 using namespace std;
+mt19937 ran(time(0));
+int n, m, q;
 int main() {
+    freopen("in", "w", stdout);
+    n = ran() % 500 + 1;
+    m = ran() % 20000 + 1;
+    q = ran() % 200 + 1;
+    printf("0 %d %d 20 %d\n", n, m, q);
+    for(int i = 1; i <= m; ++i) {
+        printf("%d ", ran() % (1000000000) + 1);
+    }
+    putchar('\n');
+    for(int i = 1; i <= n; ++i) {
+        bool vis[m + 1] = {0};
+        int k = ran() % m + 1;
+        printf("%d ", k);
+        for(int j = 1; j <= k; ++j) {
+            int sta = ran() % m + 1;
+            while(vis[sta + 1]) sta = ran() % m + 1;
+            vis[sta] = 1;
+            printf("%d %d ", sta, ran() % (1000000000) + 1);
+        }
+        putchar('\n');
+    }
+    while(q--) {
+        int x = ran() % m + 1, y = ran() % m + 1;
+        while(x == y) x = ran() % m + 1;
+        printf("%d %d\n", x, y);
+    }
     return 0;
 }
\ No newline at end of file