Submission #527102

#	Time	Username	Problem	Language	Result	Execution time	Memory
527102		joelau	Potemkin cycle (CEOI15_indcyc)	C++14	30 / 100	4 ms	844 KiB

indcyc

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

int N,M, A[15], X;
vector<int> lst[15];
bitset<15> visited;
bool can;

void dfs (int x) {
    visited[x] = true;
    int num = 0;
    for (int v: lst[x]) if (X & (1<<v)) num++;
    if (num != 2) can = false;
    for (int v: lst[x]) if ((X & (1<<v)) && !visited[v]) dfs(v);
}

void dfs2 (int x) {
    visited[x] = true;
    cout << x+1 << ' ';
    for (int v: lst[x]) if ((X & (1<<v)) && !visited[v]) dfs2(v);
}

int main() {
    ios_base::sync_with_stdio(false); cin.tie(NULL);
    cin >> N >> M;
    for (int i = 0; i < M; ++i) {
        int u,v; cin >> u >> v; u--, v--;
        lst[u].push_back(v), lst[v].push_back(u);
    }
    for (int i = 0; i < (1<<N); ++i) if (__builtin_popcount(i) >= 4) {
        X = i, can = true;
        visited.reset();
        for (int j = 0; j < N; ++j) if (i & (1<<j)) {
            dfs(j);
            for (int k = 0; k < N; ++k) if ((i & (1<<k)) && !visited[k]) can = false;
            if (can) {
                visited.reset();
                dfs2(j);
                return 0;
            }
            else break;
        }
    }
    cout << "no";

    return 0;
}

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