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Problem of the day

You are given an integer â€˜Nâ€™ which denotes a set of N people numbered from 1 to N and a matrix â€˜DISLIKEâ€™ with M rows and 2 columns. Each row in the matrix denotes two people who dislike each other i.e. for any valid row i, DISLIKE[i][0] dislikes DISLIKE[i][1] and vice versa.

Your task is to split the set of N people into two groups under the conditions:

1. It is not allowed to put two persons in the same group who dislike each other.

2. The size of the two groups may or may not be equal.

3. Each person from the set belongs to exactly one group.

Detailed explanation

```
1<= T <= 10
1 <= N <= 2000
0 <= M <= 5000
DISLIKE[i].size = 2
1 <= DISLIKE[i][0],DISLIKE[i][1] <=N
DISLIKE[i][0] != DISLIKE[i][1], for any valid i
Where â€™Tâ€™ is the number of test cases, and N denotes the number of people in the setâ€™, M denotes the size of the given matrix â€˜DISLIKEâ€™.
Time Limit: 1 sec.
```

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

```
1
0
```

```
In the first test case, there is a set of 5 people and the size of the dislike matrix is 4. Pairs of people who dislike each other are {1,2}, {1,3}, {1,4}, {1,5}.
It means we can divide the given set of 5 people into two groups by keeping Person 1 in the first group and all the other people in the second group.
In the second test case, there is a set of 5 people and the size of the dislike matrix is 5. Pairs of people who dislike each other are {2,3}, {3,4}, {4,5}, {1,5}, {1,2}.
There is no possible division that can divide the set of 5 people into 2 groups.
```

```
2
4 3
1 2
1 3
2 4
10 9
1 2
1 3
1 4
1 5
1 8
1 6
1 9
1 7
1 10
```

```
1
1
```