This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define pi pair<int,int>
const int N=2e5+4;
vector<int> root(N), dist(N);
int find(int x){
if(x==root[x])return x;
return find(root[x]);
}
int cnt(int x){
if(x==root[x])return dist[x];
return dist[x] + cnt(root[x]);
}
bool unify(int x, int y){
int a=find(x);
int b=find(y);
int c1=cnt(x), c2=cnt(y);
// cout<<a<<" "<<b<<endl;
if(a!=b){
root[b]=a;
dist[b]=1;
}
if(a==b && c1%2==c2%2){
return true;
}
return false;
}
int32_t main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
int n,m,q;
cin>>n>>m>>q;
vector<pi> edge;
for(int j=0; j<m; j++){
int u,v;
cin>>u>>v;
edge.push_back({u,v});
}for(int j=0; j<q; j++){
int l,r;
cin>>l>>r;
l--;
r--;
for(int i=1; i<=n; i++)root[i]=i, dist[i]=0;
string ans="NO";
for(int i=0; i<l; i++){
auto p=edge[i];
if(unify(p.first, p.second)){
ans="YES";
//cout<<cnt(p.first)<<" "<<cnt(p.second)<<endl;
}
}for(int i=r+1; i<m; i++){
auto p=edge[i];
if(unify(p.first, p.second)){
ans="YES";
//cout<<cnt(p.first)<<" "<<cnt(p.second)<<endl;
}
}cout<<ans<<endl;
}
return 0;
}
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