Submission #203457

#	Time	Username	Problem	Language	Result	Execution time	Memory
203457		mdn2002	Three Friends (BOI14_friends)	C++14	100 / 100	127 ms	12308 KiB

friends

#include<bits/stdc++.h>
using namespace std;
int n;
string a,x,ox,y,oy;
int main()
{
    cin>>n>>a;
    if(n%2==0)
    {
        cout<<"NOT POSSIBLE";
        return 0;
    }
    for(int i=0;i<n/2;i++)x.push_back(a[i]);
    for(int i=(n/2)+1;i<n;i++)y.push_back(a[i]);
    ox=x;
    oy=y;
    x+=x;
    y+=y;
    int cnt=0,aa=0,bb=0;
    for(int i=0,j=0;i<n;i++)
    {
        if(a[i]==x[j])j++;
        else cnt++;
        if(cnt>1)break;
        if(i==n-1)aa++;
    }
    cnt=0;
    for(int i=0,j=0;i<n;i++)
    {
        if(a[i]==y[j])j++;
        else cnt++;
        if(cnt>1)break;
        if(i==n-1)bb++;
    }
    if(aa+bb==0)
    {
        cout<<"NOT POSSIBLE";
        return 0;
    }
    if(aa+bb==2&&ox!=oy)
    {
        cout<<"NOT UNIQUE";
        return 0;
    }
    if(aa)cout<<ox;
    else if(bb)cout<<oy;
}

• Subtask 1: 35 / 35
• Subtask 2: 65 / 65