Submission #553402

#	Time	Username	Problem	Language	Result	Execution time	Memory
553402		Hanksburger	JJOOII 2 (JOI20_ho_t2)	C++17	100 / 100	15 ms	1636 KiB

ho_t2

#include <bits/stdc++.h>
using namespace std;
vector<int> J, O, I;
int main()
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	int n, k, ans=1e9;
	cin >> n >> k;
	for (int i=1; i<=n; i++)
	{
		char x;
		cin >> x;
		if (x=='J')
			J.push_back(i);
		else if (x=='O')
			O.push_back(i);
		else
			I.push_back(i);
	}
	for (int i=0; i<=O.size()-k; i++)
	{
		int index=lower_bound(J.begin(), J.end(), O[i])-J.begin()-k;
		int jndex=lower_bound(I.begin(), I.end(), O[i+k-1])-I.begin()+k-1;
		if (index>=0 && jndex<I.size())
			ans=min(ans, I[jndex]-J[index]+1-k*3);
	}
	if (ans==1e9)
		cout << -1;
	else
		cout << ans;
	return 0;
}

Compilation message (stderr)

ho_t2.cpp: In function 'int main()':
ho_t2.cpp:22:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |  for (int i=0; i<=O.size()-k; i++)
      |                ~^~~~~~~~~~~~
ho_t2.cpp:26:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |   if (index>=0 && jndex<I.size())
      |                   ~~~~~^~~~~~~~~

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