Submission #1115046

#	Time	Username	Problem	Language	Result	Execution time	Memory
1115046		AdamGS	JJOOII 2 (JOI20_ho_t2)	C++17	0 / 100	1 ms	336 KiB

ho_t2

#include <iostream>
#include <algorithm>
#include <cmath>
#include <queue>
#include <vector>
#include <stack>
#include <string>

using namespace std;

typedef long long ll;

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    ll n, k; cin >> n >> k;
    string s; cin >> s;
    if(s.find_first_of('J') > s.find_last_of('I')) {
        cout << -1;
        return 0;
    }

    s = s.substr(s.find_first_of('J'), s.find_last_of('I') - s.find_first_of('J') + 1);
    n = s.size();
    ll mn = 1e10;
    for(int i = 0; i < n; i++) {
        char c = s[i];
        if(c == 'J') {
            ll ileo = 0, ilej = 1, ilei = 0, usu = 0;
            for(int j = 0; j < n; j++) {
                char z = s[j];
                if(z == 'O') {
                    if(ileo < k) {
                        ilei = 0;
                        ileo++;
                    } else {
                        usu++;
                    }
                }
                if(z == 'J') {
                    if(ilej < k) {
                        ileo = 0;
                        ilei = 0;
                        ilej++;
                    } else {
                        usu++;
                    }
                }
                if(z == 'I') {
                    if(ilei + 1 >= k && ilej >= k && ileo >= k) {
                        ilei++;
                        break;
                    } else {
                        ilei++;
                    }
                }
            }
            if(ilei >= k && ileo >= k && ilej >= k) {
                mn = min(usu, mn);
            }
        }
    }
    cout << (mn <= 2e8 ? mn : -1);

    return 0;
}

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