Submission #63831114

Source Code Expand

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#include<bits/stdc++.h>
using namespace std;
int main(){
    int n, k; 
    cin>>n>>k;
    int nk = n*k;
    if(nk==1){
        cout<<"Yes"<<"\n";
        return 0;
    }
    vector<vector<int>> adj(nk);
    for(int i=0;i<nk-1;i++){
        int u,v;
        cin>>u>>v;
 
 
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#include<bits/stdc++.h>

using namespace std;

int main(){

    int n, k; 
    cin>>n>>k;

    int nk = n*k;

    if(nk==1){
        cout<<"Yes"<<"\n";
        return 0;
    }

    vector<vector<int>> adj(nk);

    for(int i=0;i<nk-1;i++){
        int u,v;
        cin>>u>>v;
        u--;v--;
        adj[u].emplace_back(v);
        adj[v].emplace_back(u);
    }

    queue<int> q;
    vector<bool> vis(nk,false); 

    for(int i=0;i<nk;i++){
        if(adj[i].size()==1) {
            q.push(i);
        }
    }
    
    bool flag = true;

    while(!q.empty()){
        int u = q.front();
        q.pop();
        if(vis[u]) continue;
        vis[u] = true;
        int ck = k-1;
        while(ck--){
            bool nn = false;
            for(auto e:adj[u]) if(!vis[e]){
                nn = true;
                u = e;
                vis[u] = true;
                break;
            }
            if(!nn) break;
        }

        if(ck!=-1){
            flag = false;
            break;
        }else{
            for(auto e:adj[u]) if(!vis[e]){
                q.push(e);
            }
        }
    }
    
    for(auto e:vis) if(!e){
        flag = false;
        break;
    }

    cout<<(flag?"Yes":"No")<<"\n";


    return 0;
}

Submission Info

Judge Result