Submission #1186928

#	Time	Username	Problem	Language	Result	Execution time	Memory
1186928		Unforgettablepl	Newspapers (CEOI21_newspapers)	C++20	Compilation error	0 ms	0 KiB

newspapers

#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;
    cin >> N >> M;
    vector<vector<int>> adj(N+1);
    for(int i=1;i<=M;i++){
        int u,v;cin>>u>>v;
        adj[u].emplace_back(v);
        adj[v].emplace_back(u);
    }
    vector<int> degree(N+1);
    for(int i=1;i<=N;i++){
        for(int&j:adj[i])if(adj[j].size()>1)degree[i]++;
    }
    pair<int,int> maxDegree = {0,0};
    for(int i=1;i<=N;i++)maxDegree=max(maxDegree,{degree[i],i});
    int secondmax = 0;
    for(int i=1;i<=N;i++)if(i!=maxDegree.second)secondmax=max(secondmax,degree[i]);
    if(M==N-1 and secondmax.first<=3){
        cout<<"YES\n";
        cout << 2*N-1 << '\n';
        for(int i=1;i<=N;i++)cout<<i<<' ';
        for(int i=1;i<N;i++)cout<<N-i+1<<' ';
        cout << '\n';
    } else cout<<"NO\n";
}

Compilation message (stderr)

newspapers.cpp: In function 'int32_t main()':
newspapers.cpp:26:29: error: request for member 'first' in 'secondmax', which is of non-class type 'long long int'
   26 |     if(M==N-1 and secondmax.first<=3){
      |                             ^~~~~