#include<bits/stdc++.h>
using namespace std;
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#define int long long
#define pb push_back
#define ff first
#define ss second
const int N=1e5+5;
vector<int>ans;
void fun(int n){
if(n%2==0){
cout<<"NOT POSSIBLE";
return ;
}
string s;
set<string>st;
cin>>s;
for(int i=0;i<n;i++){
string tmp;
for(int j=0;j<n;j++){
if(i==j)continue;
tmp+=s[j];
}
if(tmp.substr(0,n/2)==tmp.substr(n/2,n/2)){
st.insert(tmp.substr(0,n/2));
}
}
if(st.size()>1){
cout<<"NOT UNIQUE";
}
else if(st.size()==0){
cout<<"NOT POSSIBLE";
}
else cout<< *st.begin();
}
signed main(){
int n;
cin>>n;
if(n<=2001){
fun(n);
return 0;
}
string s;
set<char>st;
cin>>s;
if(n%2==0){
cout<<"NOT POSSIBLE";
return 0;
}
int l1=0;
int r1=n/2+1;
int cnt1=0;
int u1=0;
int e1=0;
while(cnt1!=n/2){
if(s[l1]!=s[r1]){
l1++;
e1=1;
u1++;
if(u1==2){
e1=0;
break;
}
}
l1++;
r1++;
cnt1++;
}
int p1=1;
if(u1==2 and e1==0){
p1=0;
}
reverse(s.begin(),s.end());
int l2=0;
int r2=n/2+1;
int cnt2=0;
int u2=0;
int e2=0;
while(cnt2!=n/2){
if(s[l2]!=s[r2]){
l2++;
e2=1;
u2++;
if(u2==2){
e2=0;
break;
}
}
l2++;
r2++;
cnt2++;
}
int p2=1;
if(e1 and e2){
cout<<"NOT UNIQUE";
return 0;
}
if(u1==2 and u2==2){
cout<<"NOT POSSIBLE";
return 0;
}
reverse(s.begin(),s.end());
if(p1){
cout<<s.substr(n/2+1,n/2);
return 0;
}
if(p2){
cout<<s.substr(0,n/2);
return 0;
}
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
348 KB |
Output is correct |
| 2 |
Correct |
0 ms |
348 KB |
Output is correct |
| 3 |
Correct |
0 ms |
348 KB |
Output is correct |
| 4 |
Correct |
0 ms |
348 KB |
Output is correct |
| 5 |
Correct |
0 ms |
348 KB |
Output is correct |
| 6 |
Correct |
0 ms |
348 KB |
Output is correct |
| 7 |
Correct |
0 ms |
348 KB |
Output is correct |
| 8 |
Correct |
0 ms |
348 KB |
Output is correct |
| 9 |
Correct |
0 ms |
348 KB |
Output is correct |
| 10 |
Correct |
0 ms |
348 KB |
Output is correct |
| 11 |
Correct |
0 ms |
348 KB |
Output is correct |
| 12 |
Correct |
0 ms |
348 KB |
Output is correct |
| 13 |
Correct |
0 ms |
348 KB |
Output is correct |
| 14 |
Correct |
0 ms |
348 KB |
Output is correct |
| 15 |
Correct |
0 ms |
348 KB |
Output is correct |
| 16 |
Correct |
0 ms |
348 KB |
Output is correct |
| 17 |
Correct |
0 ms |
348 KB |
Output is correct |
| 18 |
Correct |
1 ms |
348 KB |
Output is correct |
| 19 |
Correct |
0 ms |
348 KB |
Output is correct |
| 20 |
Correct |
0 ms |
348 KB |
Output is correct |
| 21 |
Correct |
0 ms |
348 KB |
Output is correct |
| 22 |
Correct |
0 ms |
348 KB |
Output is correct |
| 23 |
Correct |
0 ms |
348 KB |
Output is correct |
| 24 |
Correct |
1 ms |
348 KB |
Output is correct |
| 25 |
Correct |
0 ms |
348 KB |
Output is correct |
| 26 |
Correct |
0 ms |
348 KB |
Output is correct |
| 27 |
Correct |
0 ms |
348 KB |
Output is correct |
| 28 |
Correct |
0 ms |
348 KB |
Output is correct |
| 29 |
Correct |
0 ms |
344 KB |
Output is correct |
| 30 |
Correct |
0 ms |
348 KB |
Output is correct |
| 31 |
Correct |
0 ms |
348 KB |
Output is correct |
| 32 |
Correct |
0 ms |
348 KB |
Output is correct |
| 33 |
Correct |
0 ms |
348 KB |
Output is correct |
| 34 |
Correct |
1 ms |
348 KB |
Output is correct |
| 35 |
Correct |
0 ms |
348 KB |
Output is correct |
| 36 |
Correct |
0 ms |
348 KB |
Output is correct |
| 37 |
Correct |
0 ms |
348 KB |
Output is correct |
| 38 |
Correct |
1 ms |
440 KB |
Output is correct |
| 39 |
Correct |
0 ms |
348 KB |
Output is correct |
| 40 |
Correct |
0 ms |
348 KB |
Output is correct |
| 41 |
Correct |
1 ms |
348 KB |
Output is correct |
| 42 |
Correct |
0 ms |
348 KB |
Output is correct |
| 43 |
Correct |
0 ms |
348 KB |
Output is correct |
| 44 |
Correct |
8 ms |
452 KB |
Output is correct |
| 45 |
Correct |
8 ms |
436 KB |
Output is correct |
| 46 |
Correct |
8 ms |
348 KB |
Output is correct |
| 47 |
Correct |
8 ms |
344 KB |
Output is correct |
| 48 |
Correct |
8 ms |
348 KB |
Output is correct |
| 49 |
Correct |
0 ms |
348 KB |
Output is correct |
| 50 |
Correct |
8 ms |
348 KB |
Output is correct |
| 51 |
Correct |
6 ms |
436 KB |
Output is correct |
| 52 |
Correct |
6 ms |
348 KB |
Output is correct |
| 53 |
Correct |
7 ms |
436 KB |
Output is correct |
| 54 |
Correct |
5 ms |
348 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
31 ms |
6196 KB |
Output is correct |
| 2 |
Correct |
30 ms |
5444 KB |
Output is correct |
| 3 |
Correct |
30 ms |
5452 KB |
Output is correct |
| 4 |
Correct |
38 ms |
5236 KB |
Output is correct |
| 5 |
Correct |
30 ms |
6224 KB |
Output is correct |
| 6 |
Correct |
28 ms |
5968 KB |
Output is correct |
| 7 |
Correct |
31 ms |
5568 KB |
Output is correct |
| 8 |
Correct |
26 ms |
2324 KB |
Output is correct |
| 9 |
Correct |
27 ms |
3920 KB |
Output is correct |
| 10 |
Correct |
28 ms |
3920 KB |
Output is correct |
| 11 |
Correct |
23 ms |
2320 KB |
Output is correct |
| 12 |
Correct |
0 ms |
348 KB |
Output is correct |
| 13 |
Correct |
0 ms |
348 KB |
Output is correct |
| 14 |
Correct |
0 ms |
348 KB |
Output is correct |
| 15 |
Correct |
1 ms |
348 KB |
Output is correct |
| 16 |
Correct |
0 ms |
348 KB |
Output is correct |
| 17 |
Correct |
0 ms |
348 KB |
Output is correct |
| 18 |
Correct |
1 ms |
348 KB |
Output is correct |
| 19 |
Correct |
0 ms |
348 KB |
Output is correct |
| 20 |
Correct |
0 ms |
348 KB |
Output is correct |
| 21 |
Correct |
0 ms |
348 KB |
Output is correct |
| 22 |
Correct |
0 ms |
348 KB |
Output is correct |
| 23 |
Correct |
0 ms |
348 KB |
Output is correct |
| 24 |
Correct |
0 ms |
348 KB |
Output is correct |
| 25 |
Correct |
0 ms |
348 KB |
Output is correct |
| 26 |
Correct |
0 ms |
348 KB |
Output is correct |
| 27 |
Correct |
1 ms |
348 KB |
Output is correct |
| 28 |
Correct |
0 ms |
348 KB |
Output is correct |
| 29 |
Correct |
0 ms |
348 KB |
Output is correct |
| 30 |
Correct |
0 ms |
348 KB |
Output is correct |
| 31 |
Correct |
0 ms |
348 KB |
Output is correct |
| 32 |
Correct |
0 ms |
348 KB |
Output is correct |
| 33 |
Correct |
0 ms |
348 KB |
Output is correct |
| 34 |
Correct |
0 ms |
348 KB |
Output is correct |
| 35 |
Correct |
1 ms |
348 KB |
Output is correct |
| 36 |
Correct |
0 ms |
348 KB |
Output is correct |
| 37 |
Correct |
0 ms |
348 KB |
Output is correct |
| 38 |
Correct |
0 ms |
348 KB |
Output is correct |
| 39 |
Correct |
0 ms |
348 KB |
Output is correct |
| 40 |
Correct |
0 ms |
348 KB |
Output is correct |
| 41 |
Correct |
1 ms |
348 KB |
Output is correct |
| 42 |
Correct |
0 ms |
432 KB |
Output is correct |
| 43 |
Correct |
0 ms |
348 KB |
Output is correct |
| 44 |
Correct |
0 ms |
348 KB |
Output is correct |
| 45 |
Correct |
1 ms |
348 KB |
Output is correct |
| 46 |
Correct |
0 ms |
348 KB |
Output is correct |
| 47 |
Correct |
0 ms |
348 KB |
Output is correct |
| 48 |
Correct |
1 ms |
348 KB |
Output is correct |
| 49 |
Correct |
0 ms |
348 KB |
Output is correct |
| 50 |
Correct |
0 ms |
348 KB |
Output is correct |
| 51 |
Correct |
0 ms |
348 KB |
Output is correct |
| 52 |
Correct |
0 ms |
348 KB |
Output is correct |
| 53 |
Correct |
0 ms |
348 KB |
Output is correct |
| 54 |
Correct |
0 ms |
348 KB |
Output is correct |
