Submission #1111852

#	Time	Username	Problem	Language	Result	Execution time	Memory
1111852		Ghulam_Junaid	Potemkin cycle (CEOI15_indcyc)	C++17	70 / 100	1082 ms	3212 KiB

indcyc

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

const int N = 1005;
int n, m, par[N];
bool is_edge[N][N], vis[N];
vector<int> g[N];
vector<pair<int, int>> edges;

void bfs(int id){
    auto [x, y] = edges[id];
    memset(vis, 0, sizeof vis);
    memset(par, -1, sizeof par);
    for (int z = 1; z <= n; z ++)
        vis[z] = (is_edge[x][z] and is_edge[z][y]);

    queue<int> q;
    q.push(x);
    vis[x] = 1;

    while (!q.empty()){
        int v = q.front();
        q.pop();

        for (int e : g[v]){
            if (e == id) continue;
            int u = edges[e].first + edges[e].second - v;
            if (vis[u]) continue;
            par[u] = v;
            vis[u] = 1;
            q.push(u);
        }
    }
}

int main(){
    cin >> n >> m;
    for (int e = 0; e < m; e ++){
        int u, v;
        cin >> u >> v;

        edges.push_back({u, v});
        g[u].push_back(e);
        g[v].push_back(e);
        is_edge[u][v] = is_edge[v][u] = 1;
    }

    for (int e = 0; e < m; e ++){
        bfs(e);
        auto [u, v] = edges[e];
        if (vis[u] and vis[v]){
            while (v != u){
                cout << v << " ";
                v = par[v];
            }
            cout << u << endl;
            return 0;
        }
    }

    cout << "no" << endl;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10