Submission #3567

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
3567	2013-08-31T06:37:35 Z	tncks0121	Cactus? Not cactus? (kriii1_C)	C++	1 / 1	112 ms	13380 KB

C

#include <stdio.h>
#include <vector>
#include <stack>
using namespace std;

vector<int> G[100010],C[100010]; int Q[100010]; bool chk[100010];
int N,M;

void in(int x, int y)
{
	C[x].push_back(y);
	C[y].push_back(x);
}

int Depth[100010],Low[100010];
stack<pair<int, int> > S;

int main()
{
	int i,j,x,y;

	scanf ("%d %d",&N,&M);
	for (i=0;i<M;i++){
		scanf ("%d %d",&x,&y);
		G[x].push_back(y);
		G[y].push_back(x);
	}

	S.push(make_pair(1,-1)); Depth[1] = Low[1] = 1;
	while (!S.empty()){
		x = S.top().first; i = S.top().second; S.pop();

		if (i >= 0){
			if (Low[x] > Low[G[x][i]])
				Low[x] = Low[G[x][i]];
		}
		
		for (i++;i<G[x].size();i++){
			y = G[x][i];
			if (Depth[y] == 0){
				Depth[y] = Low[y] = Depth[x] + 1;
				S.push(make_pair(x,i));
				S.push(make_pair(y,-1));
				break;
			}
			else{
				if (Depth[y] + 1 < Depth[x]){
					in(x,y);
					if (Low[x] > Depth[y])
						Low[x] = Depth[y];
				}
			}
		}

		if (i == G[x].size() && !S.empty()){
			if (Low[x] <= Depth[S.top().first]){
				in(x,S.top().first);
			}
		}
	}

	for (i=1;i<=N;i++) if (!chk[i]){
		int head = -1, tail = -1;
		int V = 0, E = 0;

		Q[++head] = i; chk[i] = 1;
		while (tail < head){
			x = Q[++tail];
			V++; E += C[x].size();
			for (j=0;j<C[x].size();j++){
				y = C[x][j];
				if (!chk[y]){
					Q[++head] = y; chk[y] = 1;
				}
			}
		}

		if (V * 2 < E){puts("Not cactus"); return 0;}
	}
	puts("Cactus");

	return 0;
}

Subtask #1

1.0 / 1.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	7200 KB	Output is correct
2	Correct	0 ms	7200 KB	Output is correct
3	Correct	4 ms	7464 KB	Output is correct
4	Correct	4 ms	7328 KB	Output is correct
5	Correct	0 ms	7328 KB	Output is correct
6	Correct	0 ms	7332 KB	Output is correct
7	Correct	0 ms	7464 KB	Output is correct
8	Correct	4 ms	7332 KB	Output is correct
9	Correct	4 ms	7464 KB	Output is correct
10	Correct	32 ms	10104 KB	Output is correct
11	Correct	24 ms	9952 KB	Output is correct
12	Correct	44 ms	11012 KB	Output is correct
13	Correct	56 ms	11408 KB	Output is correct
14	Correct	56 ms	10880 KB	Output is correct
15	Correct	68 ms	12068 KB	Output is correct
16	Correct	56 ms	11148 KB	Output is correct
17	Correct	44 ms	10760 KB	Output is correct
18	Correct	84 ms	12852 KB	Output is correct
19	Correct	112 ms	13380 KB	Output is correct
20	Correct	56 ms	10756 KB	Output is correct
21	Correct	84 ms	12848 KB	Output is correct
22	Correct	80 ms	12204 KB	Output is correct
23	Correct	0 ms	7200 KB	Output is correct
24	Correct	0 ms	7200 KB	Output is correct
25	Correct	4 ms	7728 KB	Output is correct
26	Correct	92 ms	12724 KB	Output is correct
27	Correct	32 ms	9424 KB	Output is correct
28	Correct	80 ms	12076 KB	Output is correct
29	Correct	76 ms	12052 KB	Output is correct
30	Correct	44 ms	9708 KB	Output is correct
31	Correct	64 ms	12068 KB	Output is correct
32	Correct	80 ms	12712 KB	Output is correct
33	Correct	88 ms	12712 KB	Output is correct
34	Correct	88 ms	12724 KB	Output is correct