BIRTHDAY GIFT
C++
// codewindow.in
// Birthday gift
// code in C++
#include<bits/stdc++.h>
#define m 10000000007
using namespace std;
int substring_k(string str, int length, int k){
int count = 0;
int array[26];
for (int i = 0; i < length; i++){
int temp = 0;
memset(array, 0, sizeof(array));
for (int j = i; j < length; j++){
if(array[str[j]- 'a'] == 0){
temp++;
}
array[str[j] - 'a']++;
if (temp == k){
count++;
}
if(temp > k){
break;
}
}
}
return count;
}
int main(){
string str;
cin>>str;
int length = str.length();
int k;
cin>>k;
cout<<substring_k(str, length, k)%m;
return 0;
}
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