Peli

#include <bits/stdc++.h>
 
typedef long long ll;
 
#define M 1000000007
#define N (1 << 18)
 
using namespace std;
 
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int n, k;
    string v;
    cin >> n >> k;
    cin >> v;
 
    if (k < 3 || n < 3) {
        cout << 0 << "\n";
        return 0;
    }
 
    int ans = 0;
    for (int i = 2; i < n; ++i) {
        set<char> st;
 
        for (int j = i; j >= i - 2; --j) {
            st.insert(v[j]);
        }
 
        if (st.find('A') != st.end() && st.find('B') != st.end() && st.find('C') != st.end()) {
            ans++;
            i += 2;
        }
    }
 
    cout << ans << "\n";
 
    return 0;
}

Test 1

Group: 1, 2, 3

Verdict: WRONG ANSWER

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