func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 1e3 + 10, M = 2e5 + 10;   struct upd {     int r, s, t, id;   } t;   vector<upd> v[M];   struct edge {     int x, y;   } e[M];   int ans[M], n, m, qi, f[N][N];   signed main() {     int x;     scanf( %d %d %d , &n, &m, &qi);     for (register int i = (1); i <= (m); ++i) scanf( %d %d , &e[i].x, &e[i].y);     for (register int i = (1); i <= (qi); ++i)       scanf( %d %d %d %d , &x, &t.r, &t.s, &t.t), t.id = i, v[x].push_back(t);     int p = qi;     memset(f, 0x3f, sizeof(f));     for (register int i = (m); i >= (1); --i) {       int x = e[i].x, y = e[i].y;       f[x][y] = f[y][x] = i;       for (register int j = (1); j <= (n); ++j)         f[x][j] = min(f[x][j], f[y][j]), f[y][j] = min(f[y][j], f[x][j]);       int l = v[i].size() - 1;       for (register int j = (0); j <= (l); ++j)         ans[v[i][j].id] = (f[v[i][j].s][v[i][j].t] <= v[i][j].r);     }     for (register int i = (1); i <= (qi); ++i) printf(ans[i] ?  Yes n  :  No n );     return 0;   }   