Submission #257375

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
257375	2020-08-04T07:43:55 Z	super_j6	Potemkin cycle (CEOI15_indcyc)	C++14	20 / 100	15 ms	1920 KB

indcyc

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <string.h>
#include <vector>
#include <queue>
using namespace std;
#define endl '\n'
#define ll long long
#define pi pair<int, int>
#define f first
#define s second

const int mxn = 1000;
int n, m;
int p[mxn], r[mxn];
bool a[mxn][mxn];
vector<int> ans;
vector<int> g[mxn];
queue<int> q;

bool bfs(int x){
	for(int s1 : g[x])
	for(int s2 : g[x]){
		if(a[s1][s2]) continue;
		memset(r, -1, sizeof(r));	
		p[x] = -1, r[x] = x;
		p[s1] = x, r[s1] = s1;
		p[s2] = x, r[s2] = s2;
		q.push(s1), q.push(s2);
		while(!q.empty()){
			int c = q.front();
			q.pop();
			for(int i : g[c]){
				if(!~r[i]){
					p[i] = c, r[i] = c == x ? i : r[c];
					q.push(i);
				}else if(!a[r[i]][r[c]]){
					for(int j = i; ~j; j = p[j]) ans.push_back(j + 1);
					reverse(ans.begin(), ans.end());
					for(int j = c; j != x; j = p[j]) ans.push_back(j + 1);
					return 1;
				}
			}
		}
	}
	return 0;
}

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	
	cin >> n >> m;
	
	for(int i = 0; i < n; i++) a[i][i] = 1;
	for(int i = 0; i < m; i++){
		int u, v;
		cin >> u >> v;
		u--, v--;
		a[u][v] = a[v][u] = 1;
		g[u].push_back(v);
		g[v].push_back(u);
	}
	
	for(int i = 0; i < n; i++) if(bfs(i)) break;
	
	if(!ans.empty()){
		cout << ans[0];
		for(int i = 1; i < ans.size(); i++) cout << " " << ans[i];
		cout << endl;
	}else{
		cout << "no" << endl;
	}

	return 0;
}

Compilation message

indcyc.cpp: In function 'int main()':
indcyc.cpp:70:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i = 1; i < ans.size(); i++) cout << " " << ans[i];
                  ~~^~~~~~~~~~~~

Subtask #1
10.0 / 10.0

#	Verdict	Memory	Grader output
1	Correct	384 KB	Output is correct
2	Correct	384 KB	Output is correct
3	Correct	384 KB	Output is correct
4	Correct	384 KB	Output is correct
5	Correct	384 KB	Output is correct

Subtask #2
0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Incorrect	0 ms	384 KB	Wrong adjacency

Subtask #3
0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Incorrect	0 ms	384 KB	Wrong adjacency
2	Halted	0 ms	0 KB	-

Subtask #4
10.0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	512 KB	Output is correct

Subtask #5
0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Incorrect	1 ms	512 KB	Wrong adjacency
2	Halted	0 ms	0 KB	-

Subtask #6
0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Incorrect	1 ms	768 KB	Wrong answer on graph without induced cycle
2	Halted	0 ms	0 KB	-

Subtask #7
0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Incorrect	1 ms	768 KB	Wrong adjacency
2	Halted	0 ms	0 KB	-

Subtask #8
0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Incorrect	9 ms	1920 KB	Wrong adjacency
2	Halted	0 ms	0 KB	-

Subtask #9
0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Incorrect	5 ms	1664 KB	Wrong adjacency
2	Halted	0 ms	0 KB	-

Subtask #10
0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Incorrect	15 ms	1792 KB	Wrong adjacency
2	Halted	0 ms	0 KB	-