Submission #1204519

#	Time	Username	Problem	Language	Result	Execution time	Memory
1204519		Unforgettablepl	Joker (BOI20_joker)	C++20	14 / 100	2094 ms	15156 KiB

Joker

#include <bits/stdc++.h>
using namespace std;

#define int long long


int32_t main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int N,M,Q;
    cin >> N >> M >> Q;
    vector<vector<pair<int,int>>> adj(N+1);
    for(int i=1;i<=M;i++){
        int u,v;
        cin >> u >> v;
        adj[u].emplace_back(v,i);
        adj[v].emplace_back(u,i);
    }
    for(int i=1;i<=Q;i++){
        int l,r;cin>>l>>r;
        vector<int> depth(N+1,-1);
        bool works = true;
        auto dfs = [&](auto&& self,int x,int dep)->void{
            depth[x]=dep;
            for(auto&[i,idx]:adj[x]){
                if(l<=idx and idx<=r)continue;
                if(depth[i]==-1){
                    self(self,i,dep+1);
                } else {
                    if((dep-depth[i])%2==0)works=false;
                }
            }
        };
        for(int i=1;i<=N;i++)if(depth[i]==-1)dfs(dfs,i,1);
        if(works)cout<<"NO\n";
        else cout<<"YES\n";
    }
}

• Subtask 1: 8 / 8
• Subtask 2: 0 / 25
• Subtask 3: 0 / 10
• Subtask 4: 0 / 22
• Subtask 5: 0 / 29
• Subtask 6: 6 / 6