Submission #3947

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
3947	2013-08-31T09:38:09 Z	wurikiji	Cactus? Not cactus? (kriii1_C)	C++	0 / 1	72 ms	11816 KB

C

#include <vector>
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <string>
#include <algorithm>
#include <stack>

using namespace std;

vector<int> node[100001];
vector<int> rv[100001];
bool chk[100001];
int group[100001];
int cnt[100001];
stack<int> st;

int ret;
int grp;
void dfs(int x)
{
	chk[x] = true;
	for(int i = 0 ;i < node[x].size();i++)
	{
		if( !chk[node[x][i]] ) 
			dfs(node[x][i]);
	}
	st.push(x);
}
void dfs2(int x)
{
	chk[x] = true;
	group[x] = grp;
	for(int i = 0 ;i < rv[x].size();i++)
	{

		if( !chk[rv[x][i]] ) {
			cnt[rv[x][i]]++;
			dfs2(rv[x][i]);
		}
		else if( group[rv[x][i]] == grp )
		{
			cnt[rv[x][i]]++;
		}
	}
}
int main(void){
	int n, m;

	scanf("%d %d",&n, &m);

	for(int i = 0 ;i < m ;i++)
	{
		int a, b;
		scanf("%d %d", &a, &b);
		node[a].push_back(b);
		rv[b].push_back(a);
	}

	memset(chk,0,sizeof(chk));
	for(int i = 1; i <= n;i++)
	{
		if( !chk[i] ) 
			dfs(i);
	}

	memset(cnt,0,sizeof(cnt));
	memset(group, 0, sizeof(group));
	memset(chk,0,sizeof(chk));

	grp = 0;
	while(!st.empty()){
		int next = st.top();
		st.pop();
		if(!chk[next])
		{
			dfs2(next);
			grp++;
		}
	}

	for(int i = 1 ;i <=n ;i++)
	{
		int count = 0;
		for(int j = 0 ;j < rv[i].size();j++)
		{
			if( group[rv[i][j]] == group[i] )
				count++;
		}
		if( count > 1 ) 
		{
			printf("Not cactus\n");
			return 0;
		}
	}

	printf("Cactus\n");
	return 0;
}

Subtask #1

0.0 / 1.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	6804 KB	Output is correct
2	Correct	4 ms	6804 KB	Output is correct
3	Correct	4 ms	6936 KB	Output is correct
4	Correct	0 ms	6936 KB	Output is correct
5	Correct	4 ms	6936 KB	Output is correct
6	Correct	4 ms	6936 KB	Output is correct
7	Correct	0 ms	6936 KB	Output is correct
8	Correct	0 ms	6936 KB	Output is correct
9	Correct	4 ms	6936 KB	Output is correct
10	Correct	52 ms	10100 KB	Output is correct
11	Correct	20 ms	9740 KB	Output is correct
12	Correct	40 ms	9968 KB	Output is correct
13	Correct	44 ms	10368 KB	Output is correct
14	Correct	52 ms	10240 KB	Output is correct
15	Correct	44 ms	10760 KB	Output is correct
16	Correct	44 ms	9972 KB	Output is correct
17	Correct	32 ms	9708 KB	Output is correct
18	Correct	60 ms	11420 KB	Output is correct
19	Correct	72 ms	11816 KB	Output is correct
20	Correct	36 ms	9840 KB	Output is correct
21	Correct	52 ms	11420 KB	Output is correct
22	Correct	44 ms	10892 KB	Output is correct
23	Incorrect	0 ms	6804 KB	Output isn't correct
24	Halted	0 ms	0 KB	-