Submission #525332

#	Time	Username	Problem	Language	Result	Execution time	Memory
525332		l3nl3	JJOOII 2 (JOI20_ho_t2)	C++17	13 / 100	2047 ms	4456 KiB

ho_t2

//#pragma GCC optimize("O3")
//#pragma GCC target ("avx2")
//#pragma GCC optimize("Ofast")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
//#pragma GCC optimize("unroll-loops")

#include <bits/stdc++.h>

#define int long long
#define all(a) a.begin(), a.end()

using namespace std;

const int N = 2e5 + 7;

int n, k, mn = 1e18;
string s;

signed main () {
  ios_base::sync_with_stdio(0);
	cin.tie(0), cout.tie(0);
	cin >> n >> k >> s;
	s = '~' + s;
	for (int i = 0; i <= n; i++) {
		int J = 0, O = 0, I = 0, res = 0;
		vector<int> aa;
		for (int j = i + 1; j <= n; j++) {
			if (s[j] == 'J') {
				if (J == k) {
					res++;
					aa.push_back(j);
					continue;
				}
				J++;
			}
			if (s[j] == 'O') {
				if (O == k || J < k) {
					res++;
					aa.push_back(j);
					continue;
				}
				O++;
			}
			if (s[j] == 'I') {
				if (I == k || O < k || J < k) {
					res++;
					aa.push_back(j);
					continue;
				}
				I++;
			}
		}
		int l = n, p = aa.size() - 1;
		while (p >= 0 && aa[p] == l) {
			l--;
			p--;
			res--;
		}
		if (J == k && O == k && I == k) mn = min(mn, res);
	}
	cout << (mn == 1e18 ? -1 : mn);
}

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