Submission #781532

#	Time	Username	Problem	Language	Result	Execution time	Memory
781532		vjudge1	JJOOII 2 (JOI20_ho_t2)	C++17	100 / 100	9 ms	2132 KiB

ho_t2

#include <bits/stdc++.h>

using namespace std;

typedef long long lo; 

#define fi first
#define se second
#define endl "\n"
#define pb push_back
#define fio() ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define FOR for(int i=1;i<=n;i++)
#define mid ((start+end)/2)
#define ort ((bas+son)/2)

const lo inf = 1000000000;
const lo li = 500005;
const lo mod = 1000000007;

int n,m,a[li],k,flag,t;
int cev;
string s;
vector<int> v[3];

inline int in(){
	int x;
	scanf("%d",&x);
	return x;
}

int main(void){
	fio();
	cin>>t>>k>>s;
	n=s.size();
	for(int i=0;i<n;i++){
		if(s[i]=='J')v[0].pb(i);
		if(s[i]=='O')v[1].pb(i);
		if(s[i]=='I')v[2].pb(i);
	}
	int siz=v[0].size();
	cev=n+1;
	for(int i=0;i<siz;i++){
		int at=i+k-1;
		if(at>=siz)break;
		int tut=v[0][at];
		int ind=upper_bound(v[1].begin(),v[1].end(),tut)-v[1].begin();
		ind+=k-1;
		if(ind>=(int)v[1].size()){break;}
		tut=v[1][ind];
		ind=upper_bound(v[2].begin(),v[2].end(),tut)-v[2].begin();
		ind+=k-1;
		if(ind>=(int)v[2].size())break;
		cev=min(cev,v[2][ind]-v[0][i]+1-3*k);
	}
	if(cev==n+1)cev=-1;
	cout<<cev<<endl;
	return 0;
}

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