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ID题目提交者结果用时内存语言文件大小提交时间测评时间
#88798#5745. Graph IsomorphismgalaxiasWA 225ms5876kbC++141.9kb2023-03-17 14:40:442023-03-17 14:40:47

Judging History

你现在查看的是最新测评结果

  • [2023-08-10 23:21:45]
  • System Update: QOJ starts to keep a history of the judgings of all the submissions.
  • [2023-03-17 14:40:47]
  • 评测
  • 测评结果:WA
  • 用时:225ms
  • 内存:5876kb
  • [2023-03-17 14:40:44]
  • 提交

answer

#include <bits/stdc++.h>
using namespace std;
const int N = 1e5 + 10;
vector<int> G[N];

int a[5][5] , n , m , deg[N] , d[5][5];

int read()
{
	int x;
	scanf("%d" , &x);
	return x;
}

int b[10] = {1 , 1 , 1 , 2 , 2 , 3} , c[10] = {2 , 3 , 4 , 3 , 4 , 4};

bool vis[10];

bool check()
{
	for(int i = 1 ; i <= 4 ; ++ i)
		for(int j = 1 ; j <= 4 ; ++ j)
			d[i][j] = 0;
	for(int i = 0 ; i < 6 ; ++ i)
		if(vis[i]) d[b[i]][c[i]] = d[c[i]][b[i]] = 1;
	int p[5];
	for(int i = 1 ; i <= n ; ++ i)
		p[i] = i;
	do
	{

		bool flag = true;
		for(int i = 1 ; i <= n ; ++ i)
			for(int j = 1 ; j <= n ; ++ j)
				if(a[i][j] ^ d[p[i]][p[j]]) flag = false;
		if(flag)
		{
			// for(int i = 0 ; i < 6 ; ++ i)
			// 	printf("%d " , vis[i]);
			// puts("");
			return true;
		}
	}while(next_permutation(p + 1 , p + 1 + n));
	return false;
}

int dfs(int now)
{
	if(now == 6) return check();
	int ret = 0;
	vis[now] = false; ret = dfs(now + 1);
	vis[now] = true; ret += dfs(now + 1) , vis[now] = false;
	return ret;
}

bool force()
{
	for(int i = 1 ; i <= n ; ++ i)
		for(int j = 1 ; j <= n ; ++ j)
			a[i][j] = 0;
	for(int i = 1 ; i <= m ; ++ i)
	{
		int x = read() , y = read();
		a[x][y] = a[y][x] = 1;
	}
	if(n <= 3) return true;
	return dfs(0) <= n;
}

bool solve()
{
	scanf("%d%d", &n, &m);
	if(n <= 4) return force();
	for(int i = 1; i <= n; i ++) deg[i] = 0;
	for(int i = 1; i <= m; i ++)
	{
		int u, v;
		scanf("%d%d", &u, &v);
		deg[u] ++;
		deg[v] ++;
	}
	if(m == 1ll * n * (n - 1) / 2) return true;
	if(m == 0) return true;
	int cnt1 = 0 , cnt2 = 0;
	for(int i = 1 ; i <= n ; ++ i)
		cnt1 += (deg[i] == 1) , cnt2 += (deg[i] == n - 1);
	if((cnt1 == n - 1) && (cnt2 == 1)) return true;
	if((cnt1 == 1) && (cnt2 == n - 1)) return true;
	return false;
}

int main()
{
	int T;
	scanf("%d", &T);
	while(T --)
		if(solve()) puts("YES");
		else puts("NO");
	return 0;
}

詳細信息

Test #1:

score: 100
Accepted
time: 4ms
memory: 5876kb

input:

3
3 3
1 2
2 3
3 1
3 2
1 2
2 3
5 5
1 2
2 3
3 4
4 5
5 1

output:

YES
YES
NO

result:

ok 3 token(s): yes count is 2, no count is 1

Test #2:

score: 0
Accepted
time: 17ms
memory: 5788kb

input:

39982
3 2
2 1
3 2
2 1
1 2
2 1
2 1
3 3
3 1
2 3
1 2
2 1
1 2
3 3
3 1
3 2
2 1
2 1
1 2
3 2
1 2
3 1
3 3
2 1
3 1
2 3
2 1
1 2
3 2
2 1
3 2
3 3
2 3
3 1
2 1
3 3
2 1
1 3
2 3
3 3
3 1
3 2
1 2
2 1
2 1
2 1
2 1
3 1
3 1
2 1
2 1
2 1
1 2
3 2
1 3
3 2
3 2
1 2
1 3
3 2
3 2
1 3
2 1
1 2
3 2
3 2
3 1
3 3
2 3
3 1
1 2
2 1
1 2
3 ...

output:

YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
...

result:

ok 39982 token(s): yes count is 39982, no count is 0

Test #3:

score: 0
Accepted
time: 225ms
memory: 5860kb

input:

33365
3 3
3 1
2 3
2 1
2 1
2 1
4 6
1 2
3 4
4 2
2 3
3 1
4 1
2 1
1 2
2 1
1 2
4 5
1 4
1 2
4 2
3 4
1 3
4 3
4 2
2 1
1 3
3 1
3 2
4 3
1 3
1 2
3 4
3 3
3 2
3 1
2 1
3 1
2 3
3 1
1 3
3 1
2 1
3 2
1 3
3 2
4 5
3 1
4 2
3 4
2 3
2 1
4 2
1 2
3 2
2 1
2 1
3 2
1 2
2 3
3 1
3 2
4 1
3 4
3 1
2 1
4 3
1 2
4 2
3 2
2 1
2 1
4 5
3 ...

output:

YES
YES
YES
YES
YES
NO
NO
YES
NO
YES
YES
YES
YES
YES
NO
NO
YES
YES
YES
NO
YES
YES
YES
NO
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
YES
YES
YES
YES
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
NO
YES
YES
YES
YES
YES
YES
NO
YES
NO
YES
YES
YES
NO
YES
YES
NO
YES
NO
YES
NO
YES
YES
YES
YES
NO
YES
YES
YES
YES
YES
...

result:

ok 33365 token(s): yes count is 25608, no count is 7757

Test #4:

score: -100
Wrong Answer
time: 150ms
memory: 5740kb

input:

28572
3 3
1 3
2 1
3 2
2 1
1 2
4 1
4 2
3 2
1 2
2 3
5 2
4 3
4 2
2 1
2 1
3 1
1 3
5 10
1 3
3 5
1 2
4 3
4 5
4 1
5 1
4 2
2 5
3 2
4 4
2 1
1 3
2 4
1 4
2 1
1 2
4 4
1 3
4 2
4 1
2 1
4 3
1 4
3 1
4 2
5 2
2 1
4 5
4 1
3 4
5 5
2 5
3 1
4 1
2 3
1 5
5 3
5 4
3 5
2 3
4 1
4 3
3 2
2 3
1 2
2 1
2 1
4 5
3 2
3 4
4 1
3 1
2 1
3...

output:

YES
YES
NO
YES
NO
YES
YES
YES
NO
YES
NO
NO
NO
NO
NO
NO
NO
YES
YES
NO
YES
NO
YES
YES
YES
NO
YES
YES
NO
YES
YES
YES
NO
NO
YES
NO
YES
YES
NO
NO
YES
NO
YES
NO
YES
YES
YES
YES
NO
YES
YES
NO
NO
NO
YES
YES
NO
YES
YES
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
YES
YES
YES
NO
NO
NO
YES
YES
YES...

result:

wrong answer expected YES, found NO [34th token]