Submission #538820

#	Time	Username	Problem	Language	Result	Execution time	Memory
538820		Antekb	Growing Vegetable is Fun 3 (JOI19_ho_t3)	C++14	0 / 100	3 ms	212 KiB

joi2019_ho_t3

#include<bits/stdc++.h>
using namespace std;
int ans;
string s;
void swa(int i){
    if(s[i]!=s[i+1]){
        swap(s[i], s[i+1]);
        ans++;
    }
}
int main(){
    int n;
    cin>>n;
    cin>>s;
    if(n==1){
        cout<<0;
        return 0;
    }
    //s='a'+s;
    for(int i=0; i<n; i++){
        if(i>=2 && (s[i-1]==s[i-2] && s[i-1]!=s[i])){
            for(int j=i-1; ;j--){
                if(j==0 || s[j]!=s[j-1]){
                    ans+=i-j-1;
                    swap(s[i], s[j+1]);
                    break;
                }
            }
        }
    }
    //cout<<s<<"\n";
    reverse(s.begin(), s.end());
    for(int i=0; i<n; i++){
        if(i>=2 && (s[i-1]==s[i-2] && s[i-1]!=s[i])){
            for(int j=i-1; ; j--){
                if(j==0 || s[j]!=s[j-1]){
                    ans+=i-j-1;
                    swap(s[i], s[j+1]);
                    break;
                }
            }
        }
    }
    //cout<<s<<"\n";
    if(s[n-1]==s[n-2])cout<<"-1";
    else cout<<ans;
}

• Subtask 1: 0 / 5
• Subtask 2: 0 / 55
• Subtask 3: 0 / 15
• Subtask 4: 0 / 25