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Problem of the day

You are given a string 'S'. A string is called a split string if it follows the conditions define below.

```
1. It can be divided into 'K' contiguous substrings such that the first letter of these substrings is the same for all the substrings.
2. It can be divided into 'K' contiguous substrings such that the first letter of these substrings is distinct for all the substrings.
```

Return 1 if 'S' is a split string otherwise return 0.

```
Let 'N' = 6, 'K' = 2, 'S' = "pppdpa".
It can be divided into "pp" and "pdpa", the first letter of the strings is same.
It can be divided into "ppp" and "dpa", the first letter of the strings is distinct.
So our answer is 1.
```

Detailed explanation

```
1 <= 'T' <= 10
1 <= 'N' <= 10^5
'S' consists of 'N' lowercase English letters.
The Sum of 'N' overall test cases does not exceed 10^5.
Time Limit: 1 sec
```

```
2
3 4
xyz
5 3
abaca
```

```
0
1
```

```
First test case:-
It can be proven that the string 'S' cannot follow the two conditions.
So our answer is 0.
Second test case:-
It can be divided into "ab", "ac", and "a", the first letter of the strings is the same.
It can be divided into "a", "ba", and "ca", the first letter of the strings is distinct.
So our answer is 1.
```

```
2
4 1
abcb
5 3
pqpsr
```

```
1
0
```