Submission #203225

#	Time	Username	Problem	Language	Result	Execution time	Memory
203225		staniewzki	JJOOII 2 (JOI20_ho_t2)	C++14	100 / 100	22 ms	1792 KiB

ho_t2

#include<bits/stdc++.h>
using namespace std;
 
int main() {
	int n, k;
	string str;
	cin >> n >> k >> str;

	vector<vector<int>> pos(3);
	vector<int> last(4, -1e9);
	map<char, int> id = {{'J', 0}, {'O', 1}, {'I', 2}};
	int ans = 1e9;

	for(int i = 0; i < n; i++) {
		last[0] = i;
		int x = id[str[i]];
		pos[x].emplace_back(last[x]);
		if(pos[x].size() >= k)
			last[x + 1] = pos[x][pos[x].size() - k];
		ans = min(ans, i - last[3] + 1 - 3 * k);
	}

	if(ans > n) ans = -1;
	cout << ans << "\n";
}

Compilation message (stderr)

ho_t2.cpp: In function 'int main()':
ho_t2.cpp:18:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(pos[x].size() >= k)
      ~~~~~~~~~~~~~~^~~~

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