Submission #1223409

#	Time	Username	Problem	Language	Result	Execution time	Memory
1223409		rhm_gan	JJOOII 2 (JOI20_ho_t2)	C++20	0 / 100	0 ms	320 KiB

ho_t2

#include <bits/stdc++.h>
using namespace std;

#ifdef LOCAL
#include "debug.h"
#else
#define dbg(...) 42
#endif

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int n, k;
    cin >> n >> k;

    string a;
    cin >> a;

    int l = 0, r = n - 1;
    while (a[l] != 'J') l++;
    while (a[r] != 'I') r--;

    string s;
    for (int i = 0; i < 3; i++) {
        for (int j = 0; j < k; j++) {
            if (i == 0) s += 'J';
            if (i == 1) s += 'O';
            if (i == 2) s += 'I';
        }
    }
    int id = 0;
    int res = 0;
    for (int i = l; i <= r; i++) {
        if (a[i] == s[id]) {
            id++;
        }
        else {
            res++;
        }
    }

    if (id != 3 * k) {
        cout << -1 << '\n';
    }
    else {
        cout << res << '\n';
    }

    return 0;
}

• Subtask 1: 0 / 1
• Subtask 2: 0 / 12
• Subtask 3: 0 / 87