Submission #1358177

#	Time	Username	Problem	Language	Result	Execution time	Memory
1358177		opeleklanos	Potemkin cycle (CEOI15_indcyc)	C++20	0 / 100	0 ms	344 KiB

indcyc

#include <iostream>
#include <vector>
using namespace std;

vector<vector<bool>> adj;
vector<int> vis;
vector<int> s;

int main(void){
    freopen("input.txt", "r", stdin);
    int n, m; cin>>n>>m;
    adj.assign(n, vector<bool>(n, 0));

    vector<pair<int, int>> edges (m, pair<int, int> {0, 0});

    for(int i = 0; i<m; i++){
        int a, b; cin>>a>>b;
        a--, b--;
        edges[i] = {a, b};
        adj[a][b] = 1;
        adj[b][a] = 1;
    }

    for(auto e:edges){
        int l = -1, r = -1;
        for(int i = 0; i<n; i++){
            if(i == e.first || i == e.second) continue;
            if(adj[e.first][i] == 1 && adj[e.second][i] == 0) l = i;
            else if(adj[e.first][i] == 0 && adj[e.second][i] == 1) r = i;
        }
        if(l != -1 && r != -1){
            cout<<l+1<<' '<<e.first+1<<' '<<e.second+1<<' '<<r+1<<endl;
            return 0;
        }
    }

    cout<<"no"<<endl;
    return 0;
}

Compilation message (stderr)

indcyc.cpp: In function 'int main()':
indcyc.cpp:10:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 |     freopen("input.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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