func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MAXN = 1005, MAXM = 200005;   int n, m, q, f[MAXN][MAXN], head[MAXM], nxt[MAXM], x[MAXM], y[MAXM];   struct Q {     int l, r, s, t;   } s[MAXM];   bool ans[MAXM];   int main() {     scanf( %d%d%d , &n, &m, &q);     for (register int i = 1; i <= m; ++i) scanf( %d%d , x + i, y + i);     for (register int i = 1; i <= q; ++i) {       scanf( %d%d%d%d , &s[i].l, &s[i].r, &s[i].s, &s[i].t);       nxt[i] = head[s[i].r];       head[s[i].r] = i;     }     for (register int u, v, k = 1; k <= m; ++k) {       u = x[k];       v = y[k];       f[u][v] = f[v][u] = k;       for (register int i = 1; i <= n; ++i)         f[u][i] = f[v][i] = max(f[u][i], f[v][i]);       for (register int i = head[k]; i; i = nxt[i])         ans[i] = s[i].l <= f[s[i].t][s[i].s];     }     for (register int i = 1; i <= q; ++i) puts(ans[i] ?  Yes  :  No );   }   