Submission #997069

#	Time	Username	Problem	Language	Result	Execution time	Memory
997069		goduadzesaba	JJOOII 2 (JOI20_ho_t2)	C++17	100 / 100	7 ms	2272 KiB

ho_t2

#include <bits/stdc++.h>
using namespace std;
const int N=2e5+5;
int n,k,ans,d,x,y; string s;
vector <int> j,o,_i;
int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
	cin>>n>>k>>s;
	for (int i=0; i<n; i++){
		if (s[i]=='J'){
			j.push_back(i+1);
		}
		if (s[i]=='O'){
			o.push_back(i+1);
		}
		if (s[i]=='I'){
			_i.push_back(i+1);
		}
	} ans=1e9;
	for (int i=0; i<(int)o.size()-k+1; i++){
		x=lower_bound(j.begin(),j.end(),o[i])-1-j.begin();
		y=lower_bound(_i.begin(),_i.end(),o[i+k-1])-_i.begin();
		if (x<k-1) continue;
		if (y>(int)_i.size()-k) continue;
		ans=min(ans,_i[y+k-1]-j[x-k+1]+1-3*k);
	}
	cout<<(ans<1e9?ans:-1);
}

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