Submission #702548

#	Time	Username	Problem	Language	Result	Execution time	Memory
702548		guagua0407	JJOOII 2 (JOI20_ho_t2)	C++17	0 / 100	0 ms	212 KiB

ho_t2

#include<bits/stdc++.h>
using namespace std;
#define f first
#define s second
#define ll long long
#define all(x) x.begin(),x.end();

int main(){
    ios::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    int n,k;
    cin>>n>>k;
    string str;
    cin>>str;
    char cur='J';
    int cnt=0;
    bool tf=false;
    int ans=0;
    for(int i=0;i<n;i++){
        if(str[i]!=cur){
            if(tf) ans++;
            continue;
        }
        if(cur=='J' and cnt==0){
            tf=true;
        }
        cnt++;
        if(cnt==k){
            if(cur=='I'){
                cout<<ans;
                return 0;
            }
            else{
                if(cur=='J') cur='O';
                else cur='I';
            }
            cnt=0;
        }
    }
    cout<<-1;
    return 0;
}

• Subtask 1: 0 / 1
• Subtask 2: 0 / 12
• Subtask 3: 0 / 87