Submission #36937

#	Time	Username	Problem	Language	Result	Execution time	Memory
36937		aome	Potemkin cycle (CEOI15_indcyc)	C++14	70 / 100	249 ms	8096 KiB

indcyc

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

const int N = 1005;

int n, m;
int nxt[N][N];
bool E[N][N];
bool finish[N][N];
vector<int> res;

void check() {
	int sz = res.size();
	for (int i = 0; i < sz; ++i) {
		for (int j = i + 2; j < sz; ++j) {
			if (i == 0 && j == sz - 1) continue;
			assert(!E[res[i]][res[j]]);
		}
	}
	for (int i = 0; i < sz; ++i) {
		assert(E[res[i]][res[(i + 1) % sz]]);
	}
	for (auto i : res) cout << i << ' ';
}

void dfs(int x, int y) {
	for (int i = 1; i <= n; ++i) {
		if (E[y][i] && !E[x][i] && i != x && !finish[y][i]) {
			if (nxt[y][i]) {
				int curx = x, cury = y;
				while (curx != y && cury != i) {
					res.push_back(cury);
					int tmp = nxt[curx][cury];
					cury = curx, curx = tmp;
				}
				res.push_back(cury), check();
				exit(0);
			}
			else nxt[y][i] = nxt[i][y] = x, dfs(y, i);
		}
	}
	finish[x][y] = finish[y][x] = 1;
}

int main() {
	ios::sync_with_stdio(false);
	cin >> n >> m;
	for (int i = 1; i <= m; ++i) {
		int u, v; cin >> u >> v;
		E[u][v] = E[v][u] = 1;
	}
	for (int i = 1; i <= n; ++i) {
		for (int j = 1; j <= n; ++j) {
			if (!E[i][j] || nxt[i][j]) continue;
			nxt[i][j] = nxt[j][i] = i, dfs(i, j);
		}
	}
	cout << "no";
}

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