Submission #99678

#	Time	Username	Problem	Language	Result	Execution time	Memory
99678		adlet	Potemkin cycle (CEOI15_indcyc)	C++17	30 / 100	1081 ms	4804 KiB

indcyc

#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>

#define file(s) if (fopen(s".in", "r")) freopen(s".in", "r", stdin), freopen(s".out", "w", stdout)
#define ios ios_base::sync_with_stdio(0), cin.tie(0)

using namespace std;

typedef long long ll;

const int N = 1e3 + 5;
const int mod = 1e9 + 7;
const int INF = 1e9;
const double PI = acos(-1.0);

int n, m, a[N][N], used[N];

vector < int > g[N], vec;

inline void rec(int p) {
    if (p >= 4) {
        if (a[vec[1]][vec[p]] == 1) {
            int ok = 1;
            for (int i = 1; i + 1 <= p; ++i) {
                int l = vec[i], r = vec[i + 1];
                if (a[l][r] != 1) {
                    ok = 0;
                    break;
                }
//                cout << vec[i] << " ";
            }
//            cout << "\n";
            if (ok)
            for (int i = 1; i <= p; ++i) {
                for (int j = 1; j + 1 < i; ++j) {
                    if (i == p && j == 1)
                        continue;
                    if (a[vec[i]][vec[j]]) {
                        ok = 0;
//                        cout << "WRONG " << vec[i] << " " << vec[j] << "\n";
                        break;
                    }
                }
                if (!ok)
                    break;
            }
            if (ok) {
                for (int i = 1; i <= p; ++i) {
                    cout << vec[i] << " ";
                }
                exit(0);
            }
        }
    }
    for (int i = 1; i <= n; ++i) {
        if (!used[i]) {
            used[i] = 1;
            vec.push_back(i);
            rec(p + 1);
            vec.pop_back();
            used[i] = 0;
        }
    }
}

int main() {
    cin >> n >> m;
    for (int i = 1, v, u; i <= m; ++i) {
        cin >> v >> u;
        a[v][u] = 1;
        a[u][v] = 1;
        g[v].push_back(u);
        g[u].push_back(v);
    }
    vec.push_back(0);
    rec(0);
    cout << "no";
}
/**
clock() / (double)CLOCKS_PER_SEC < 1.9

*/

• 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