Peli

#include <bits/stdc++.h>

using namespace std;

int n,k,r;

int main()
{
    cin>>n>>k;
    char c;
    bool A = false;
    bool B = false;
    bool C = false;
    for(int i=0;i<n;i++)
    {
        cin>>c;
        if(c == 'A') A = true;
        if(c == 'B') B = true;
        if(c == 'C') C = true;
        if(A && B && C)
        {
            r++;
            A = B = C = false;
        }
    }
    if(k < 3) cout<<0;
    else cout<<r;
}

Test 1

Group: 1, 2, 3

Verdict: ACCEPTED

Test 2

Group: 2, 3

Verdict: WRONG ANSWER

Test 3

Group: 3

Verdict: WRONG ANSWER

Test 4

Group: 1, 2, 3

Verdict: ACCEPTED

Test 5

Group: 1, 2, 3

Verdict: ACCEPTED