Submission #669262

#	Time	Username	Problem	Language	Result	Execution time	Memory
669262		GrandTiger1729	JJOOII 2 (JOI20_ho_t2)	C++17	100 / 100	8 ms	868 KiB

ho_t2

#include <iostream>
using namespace std;

int val(char c){
    if (c == 'J') return 0;
    if (c == 'O') return 1;
    if (c == 'I') return 2;
}

const int INF = 1e9 + 9;
int main(){
    cin.tie(0)->sync_with_stdio(0);
    int n, k; cin >> n >> k;
    string s; cin >> s;
    int l[3]{}, r[3]{}, cnt[3]{};
    int ans = INF;
    while (true){
        while (r[0] < n && cnt[0] < k){
            if (val(s[r[0]++]) == 0)
                cnt[0]++;
        }
        while (l[1] < r[0]){
            if (val(s[l[1]++]) == 1)
                cnt[1]--;
        }
        while (r[1] < n && cnt[1] < k){
            if (val(s[r[1]++]) == 1)
                cnt[1]++;
        }
        while (l[2] < r[1]){
            if (val(s[l[2]++]) == 2)
                cnt[2]--;
        }
        while (r[2] < n && cnt[2] < k){
            if (val(s[r[2]++]) == 2)
                cnt[2]++;
        }
        if (cnt[0] < k || cnt[1] < k || cnt[2] < k) break;
        ans = min(ans, r[2] - l[0] - 3 * k);
        if (val(s[l[0]++]) == 0)
            cnt[0]--;
    }
    cout << (ans == INF? -1: ans);
    return 0;
}

Compilation message (stderr)

ho_t2.cpp: In function 'int val(char)':
ho_t2.cpp:8:1: warning: control reaches end of non-void function [-Wreturn-type]
    8 | }
      | ^

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