Submission #831430

#	Time	Username	Problem	Language	Result	Execution time	Memory
831430		Mularstyle	JJOOII 2 (JOI20_ho_t2)	C++14	100 / 100	7 ms	2472 KiB

ho_t2

#include <bits/stdc++.h>
using namespace std;

char s[200008];
int qs[200008];

int main()
{
    int n, k;

	cin>>n>>k;
	cin>>s+1;
    n=strlen(s+1);
    vector<int> js;
    vector<int> is;

	for(int i = 1; i<= n; i++)
	{
		if(s[i] == 'J')
			js.push_back(i);
		else if(s[i] == 'O')
			qs[i] = 1;
		else
            is.push_back(i);
		qs[i] += qs[i-1];
	}
	int mn = INT_MAX;
	int cur = 0;
	for(int j = k-1; j<  js.size(); j++)
	{
		while(cur+k-1< is.size() && qs[is[cur]-1]-qs[js[j]]< k)
            cur++;

		if(cur+k-1< is.size() && qs[is[cur]-1]-qs[js[j]]>= k)
		{
			mn = min(mn, is[cur+k-1]-js[j-k+1]+1);
		}
	}

	if(mn == INT_MAX)
        cout<<"-1\n";
	else
        cout<<mn-3*k;

}

Compilation message (stderr)

ho_t2.cpp: In function 'int main()':
ho_t2.cpp:12:8: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   12 |  cin>>s+1;
      |       ~^~
ho_t2.cpp:29:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |  for(int j = k-1; j<  js.size(); j++)
      |                   ~^~~~~~~~~~~~
ho_t2.cpp:31:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |   while(cur+k-1< is.size() && qs[is[cur]-1]-qs[js[j]]< k)
      |         ~~~~~~~^~~~~~~~~~~
ho_t2.cpp:34:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |   if(cur+k-1< is.size() && qs[is[cur]-1]-qs[js[j]]>= k)
      |      ~~~~~~~^~~~~~~~~~~

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