Submission #1291049

#	Time	Username	Problem	Language	Result	Execution time	Memory
1291049		haha	JJOOII 2 (JOI20_ho_t2)	C++20	100 / 100	17 ms	3232 KiB

ho_t2

#include<bits/stdc++.h>
#define ll long long
#define f first
#define s second
using namespace std;
const int maxn=2e5+5;

int n,k;
string s;
int J[maxn],O[maxn],I[maxn];

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    cin>>n>>k>>s;
    s=" "+s;
    for(int i=1;i<=n;i++){
        J[i]=J[i-1]+(s[i]=='J');
        O[i]=O[i-1]+(s[i]=='O');
        I[i]=I[i-1]+(s[i]=='I');
    }
    int ans=1e9;
    for(int i=1;i<=n;i++){
        int pos1=lower_bound(J+1,J+n+1,J[i-1]+k)-J;
        if(J[pos1]-J[i-1]<k) continue;
        int pos2=lower_bound(O+1,O+n+1,O[pos1]+k)-O;
        if(O[pos2]-O[pos1]<k) continue;
        int pos3=lower_bound(I+1,I+n+1,I[pos2]+k)-I;
        if(I[pos3]-I[pos2]<k) continue;
        ans=min(ans,(pos3-i+1)-3*k);
    }
    if(ans==1e9) ans=-1;
    cout<<ans;

}

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