#include "bits/stdc++.h"
using namespace std;
vector <vector <int> > g;
vector <int> used;
int f;
void dfs(int v, int dist = 1, int p = -1) {
used[v] = 1;
for(auto i : g[v]) {
if(p == i) continue;
if(!used[i]) dfs(i, dist+1, v);
else {
if((used[v] - used[i] + 1)%2==1) {
// cout << v << " " << i << "\n";
f = 1;
}
}
}
}
signed main () {
int n, m, q;
cin >> n >> m >> q;
g.resize(n);
used.resize(n);
vector <pair <int,int>> edge;
for(int i = 0; i < m; i ++) {
int u, v;
cin >> u >> v;
edge.push_back({u-1, v-1});
}
while(q --) {
int l, r;
cin >> l >> r;
l --, r --;
for(auto &i : g) i.clear();
for(auto &i : used) i = 0;
for(int i = 0; i < l; i ++) {
g[edge[i].first].push_back(edge[i].second);
g[edge[i].second].push_back(edge[i].first);
}
for(int i = r+1; i < m; i ++) {
g[edge[i].first].push_back(edge[i].second);
g[edge[i].second].push_back(edge[i].first);
}
for(int i = 0; i < n; i ++) {
if(!used[i]) {
f = 0;
dfs(i);
if(f) {
cout << "YES\n";
goto end;
}
}
}
cout << "NO\n";
end:;
}
return 0;
Compilation message
Joker.cpp: In function 'int main()':
Joker.cpp:61:10: error: expected '}' at end of input
61 | return 0;
| ^
Joker.cpp:23:16: note: to match this '{'
23 | signed main () {
| ^
