/* Author : Mychecksdead */
#include<bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
typedef long long int ll;
typedef long double ld;
#define MOD (1000000000+7)
#define MOD1 (998244353)
#define PI 3.1415926535
#define pb push_back
#define setp() cout << setprecision(15)
#define all(x) x.begin(), x.end()
#define oset tree<int, null_type,less_equal<int>, rb_tree_tag,tree_order_statistics_node_update>
#define debug(x) cerr << #x << " is " << x << '\n';
const int N = 1e6+100, M = 1e5+10, F = 2147483646, K = 20;
int n, m, q, pos[N];
bool ok;
vector<int> path;
vector<pair<int, int>> g[N];
void dfs(int v, int p){
vis[v] = 1;
path.pb(v);
pos[v] = path.size();
for(auto k: g[v]){
int u = k.first;
if(l <= k.second && k.second <= r) continue;
if(u != p){
if(vis[u]){
if(pos[v] % 2 == pos[u] % 2){
ok = 1;
}
}
else
dfs(u, v);
}
}
path.pop_back();
}
void solve(){
cin >> n >> m >> q;
for(int i = 0; i < m; ++i){
int u, v; cin >> u >> v;
g[u].pb({v, i + 1});
g[v].pb({u, i + 1});
}
if(n <= 2000){
for(int i = 0; i < q; ++i){
cin >> l >> r;
vis.clear();
vis.resize(n+1);
ok = 0;
for(int v = 1; v <= n; ++v) if(!vis[v]) dfs(v, v);
if(ok) cout << "YES\n";
else cout << "NO\n";
}
}
else{
}
}
int main(){
cin.tie(0); ios::sync_with_stdio(0);
int T = 1, aa;
// cin >> T;aa=T;
while(T--){
// cout << "Case #" << aa-T << ": ";
solve();
cout << '\n';
}
return 0;
}
Compilation message
Joker.cpp: In function 'void dfs(int, int)':
Joker.cpp:24:5: error: 'vis' was not declared in this scope
24 | vis[v] = 1;
| ^~~
Joker.cpp:29:12: error: 'l' was not declared in this scope
29 | if(l <= k.second && k.second <= r) continue;
| ^
Joker.cpp:29:41: error: 'r' was not declared in this scope
29 | if(l <= k.second && k.second <= r) continue;
| ^
Joker.cpp: In function 'void solve()':
Joker.cpp:51:20: error: 'l' was not declared in this scope
51 | cin >> l >> r;
| ^
Joker.cpp:51:25: error: 'r' was not declared in this scope
51 | cin >> l >> r;
| ^
Joker.cpp:52:13: error: 'vis' was not declared in this scope
52 | vis.clear();
| ^~~
Joker.cpp: In function 'int main()':
Joker.cpp:71:16: warning: unused variable 'aa' [-Wunused-variable]
71 | int T = 1, aa;
| ^~
