Submission #774452

#	Time	Username	Problem	Language	Result	Execution time	Memory
774452		stefanneagu	JJOOII 2 (JOI20_ho_t2)	C++17	100 / 100	12 ms	2004 KiB

ho_t2

#include <iostream>
#include <vector>
using namespace std; 
int main() {
    int n, k;
    cin >> n >> k;
    string s;
    cin >> s;
    vector<int> J, O, I;
    for(int i = 0; i < n; i ++) {
        if(s[i] == 'J') {
            J.push_back(i);
        }
        if(s[i] == 'O') {
            O.push_back(i);
        }
        if(s[i] == 'I') {
            I.push_back(i);
        } 
    }
    int ans = 1e9;
    for(int i = 0; i < (int) J.size() - k + 1; i ++) {
        int pos_o = lower_bound(O.begin(), O.end(), J[i + k - 1]) - O.begin();
        if(pos_o < (int) O.size() - k + 1) {
            int pos_i = lower_bound(I.begin(), I.end(), O[pos_o + k - 1]) - I.begin();
            if(pos_i < (int) I.size() - k + 1) {
                int term = I[pos_i + k - 1];
                ans = min(ans, term - J[i] + 1 - 3 * k);
            }
        }
    }
    if(ans == 1e9) {
        cout << -1;
        return 0;
    }
    cout << ans;
    return 0;
}

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