#include <bits/stdc++.h>
using namespace std;
#define ff first
#define ss second
int n, m, q;
int vis[200005];
vector<pair<int, int> > adj[200005];
bool ok;
void dfs(int u, int p, int c, int l, int r){
vis[u] = c;
for(auto v : adj[u]){
if(v.ff == p || (l <= v.ss && v.ss <= r)) continue;
if(vis[v.ff] == vis[u]) ok = true;
if(!vis[v.ff]) dfs(v.ff, u, 3 - c, l, r);
}
}
int main(){
ios_base::sync_with_stdio(false); cin.tie(NULL);
cin >> n >> m >> q;
for(int e = 1; e < m + 1; e++){
int u, v; cin >> u >> v;
adj[u].push_back(make_pair(v, i));
adj[v].push_back(make_pair(u, i));
}
while(q--){
int l, r; cin >> l >> r;
ok = false;
memset(vis, 0, sizeof(vis));
for(int i = 1; i <= n; i++) if(!vis[i]) dfs(i, 0, 1, l, r);
if(ok) cout << "YES\n";
else cout << "NO\n";
}
}
Compilation message
Joker.cpp: In function 'int main()':
Joker.cpp:25:35: error: 'i' was not declared in this scope
25 | adj[u].push_back(make_pair(v, i));
| ^
