Submission #1116047

#	Time	Username	Problem	Language	Result	Execution time	Memory
1116047		vjudge1	Potemkin cycle (CEOI15_indcyc)	C++17	30 / 100	1028 ms	1532 KiB

indcyc

#include <bits/stdc++.h>

using i64 = long long;

#ifdef DEBUG 
    #include "/home/ahmetalp/Desktop/Workplace/debug.h"
#else
    #define debug(...) void(23)
#endif

int lsb(int x) {
    return x & -x;
}

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(nullptr);

    int N, M;
    std::cin >> N >> M;
    std::vector<std::vector<int>> adj(N);
    for (int i = 0; i < M; ++i) {
        int A, B;
        std::cin >> A >> B;
        --A, --B;
        adj[A].emplace_back(B);
        adj[B].emplace_back(A);
    }

    for (int m = 0; m < (1 << N); ++m) {
        int popcnt = __builtin_popcount(m);
        if (popcnt < 4) {
            continue;
        }
        bool good = true;
        for (int i = 0; i < N; ++i) {
            if (m >> i & 1) {
                int cnt = 0;
                for (auto j : adj[i]) {
                    if (m >> j & 1) {
                        cnt += 1;
                    }
                }
                good &= cnt == 2;
            }
        }
        if (good) {
            int u = std::__lg(lsb(m)), v = std::__lg(lsb(m ^ (1 << u)));
            for (int i = 0; i < popcnt; ++i) {
                std::cout << u + 1 << ' ';
                for (auto j : adj[u]) {
                    if (m >> j & 1) {
                        if (j != v) {
                            v = u;
                            u = j;
                            break;
                        }
                    }
                }
            }
            return 0;
        }
    }

    std::cout << "no\n";

    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