#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define int ll
int n;
string u,a,b;
bool pre[2000005],suf[2000005];
bool isa, isb;
signed main(){
ios::sync_with_stdio(false);
cin.tie(NULL);
cin >> n >> u;
if(n%2==0){
cout << "NOT POSSIBLE" << "\n";
return 0;
}
n /= 2;
for(int i=0;i<n;i++){
a += u[i];
}
for(int i=n+1;i<n*2+1;i++){
b += u[i];
}
if(a==b){
cout << a << "\n";
return 0;
}
for(int i=0;i<n;i++){
if(i==0){
if(u[i]==b[i]){
pre[i] = true;
}
else{
pre[i] = false;
}
}
else{
if(u[i]==b[i] and pre[i-1]){
pre[i] = true;
}
else{
pre[i] = false;
}
}
}
for(int i=n;i>0;i--){
if(i==n){
if(u[i]==b[i-1]){
suf[i] = true;
}
else{
suf[i] = false;
}
}
else{
if(u[i]==b[i-1] and suf[i+1]){
suf[i] = true;
}
else{
suf[i] = false;
}
}
}
if(pre[n-1] or suf[1]){
isa = true;
}
else{
for(int i=0;i<n-1;i++){
if(pre[i] and suf[i+2]){
isa = true;
break;
}
}
}
for(int i=n;i<2*n;i++){
if(i==n){
if(u[i]==a[i-n]){
pre[i] = true;
}
else{
pre[i] = false;
}
}
else{
if(u[i]==a[i-n] and pre[i-1]){
pre[i] = true;
}
else{
pre[i] = false;
}
}
}
for(int i=2*n;i>n;i--){
if(i==2*n){
if(u[i]==a[i-n-1]){
suf[i] = true;
}
else{
suf[i] = false;
}
}
else{
if(u[i]==a[i-n-1] and suf[i+1]){
suf[i] = true;
}
else{
suf[i] = false;
}
}
}
if(pre[2*n-1] or suf[n+1]){
isb = true;
}
else{
for(int i=n;i<2*n-1;i++){
if(pre[i] and suf[i+2]){
isb = true;
break;
}
}
}
if(isa and isb){
cout << "NOT UNIQUE" << "\n";
}
else{
if(isa){
cout << b << "\n";
}
else if(isb){
cout << a << "\n";
}
else{
cout << "NOT POSSIBLE" << "\n";
}
}
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
340 KB |
Output is correct |
| 2 |
Correct |
1 ms |
328 KB |
Output is correct |
| 3 |
Correct |
1 ms |
212 KB |
Output is correct |
| 4 |
Correct |
1 ms |
340 KB |
Output is correct |
| 5 |
Correct |
1 ms |
340 KB |
Output is correct |
| 6 |
Correct |
1 ms |
340 KB |
Output is correct |
| 7 |
Correct |
1 ms |
332 KB |
Output is correct |
| 8 |
Correct |
0 ms |
340 KB |
Output is correct |
| 9 |
Correct |
1 ms |
340 KB |
Output is correct |
| 10 |
Correct |
0 ms |
340 KB |
Output is correct |
| 11 |
Correct |
1 ms |
264 KB |
Output is correct |
| 12 |
Correct |
1 ms |
332 KB |
Output is correct |
| 13 |
Correct |
1 ms |
340 KB |
Output is correct |
| 14 |
Correct |
1 ms |
340 KB |
Output is correct |
| 15 |
Correct |
1 ms |
212 KB |
Output is correct |
| 16 |
Correct |
1 ms |
212 KB |
Output is correct |
| 17 |
Correct |
1 ms |
212 KB |
Output is correct |
| 18 |
Correct |
1 ms |
340 KB |
Output is correct |
| 19 |
Correct |
1 ms |
212 KB |
Output is correct |
| 20 |
Correct |
1 ms |
212 KB |
Output is correct |
| 21 |
Correct |
1 ms |
340 KB |
Output is correct |
| 22 |
Correct |
1 ms |
340 KB |
Output is correct |
| 23 |
Correct |
1 ms |
340 KB |
Output is correct |
| 24 |
Correct |
1 ms |
212 KB |
Output is correct |
| 25 |
Correct |
1 ms |
212 KB |
Output is correct |
| 26 |
Correct |
1 ms |
212 KB |
Output is correct |
| 27 |
Correct |
0 ms |
340 KB |
Output is correct |
| 28 |
Correct |
1 ms |
328 KB |
Output is correct |
| 29 |
Correct |
1 ms |
340 KB |
Output is correct |
| 30 |
Correct |
1 ms |
340 KB |
Output is correct |
| 31 |
Correct |
1 ms |
336 KB |
Output is correct |
| 32 |
Correct |
1 ms |
340 KB |
Output is correct |
| 33 |
Correct |
0 ms |
212 KB |
Output is correct |
| 34 |
Correct |
0 ms |
212 KB |
Output is correct |
| 35 |
Correct |
1 ms |
340 KB |
Output is correct |
| 36 |
Correct |
1 ms |
340 KB |
Output is correct |
| 37 |
Correct |
1 ms |
212 KB |
Output is correct |
| 38 |
Correct |
1 ms |
332 KB |
Output is correct |
| 39 |
Correct |
1 ms |
340 KB |
Output is correct |
| 40 |
Correct |
1 ms |
340 KB |
Output is correct |
| 41 |
Correct |
1 ms |
332 KB |
Output is correct |
| 42 |
Correct |
1 ms |
340 KB |
Output is correct |
| 43 |
Correct |
1 ms |
340 KB |
Output is correct |
| 44 |
Correct |
1 ms |
332 KB |
Output is correct |
| 45 |
Correct |
1 ms |
340 KB |
Output is correct |
| 46 |
Correct |
1 ms |
340 KB |
Output is correct |
| 47 |
Correct |
1 ms |
336 KB |
Output is correct |
| 48 |
Correct |
1 ms |
340 KB |
Output is correct |
| 49 |
Correct |
1 ms |
336 KB |
Output is correct |
| 50 |
Correct |
1 ms |
336 KB |
Output is correct |
| 51 |
Correct |
1 ms |
340 KB |
Output is correct |
| 52 |
Correct |
1 ms |
340 KB |
Output is correct |
| 53 |
Correct |
1 ms |
340 KB |
Output is correct |
| 54 |
Correct |
1 ms |
340 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
29 ms |
11200 KB |
Output is correct |
| 2 |
Correct |
26 ms |
11248 KB |
Output is correct |
| 3 |
Correct |
26 ms |
11164 KB |
Output is correct |
| 4 |
Correct |
27 ms |
11180 KB |
Output is correct |
| 5 |
Correct |
26 ms |
11172 KB |
Output is correct |
| 6 |
Correct |
5 ms |
4280 KB |
Output is correct |
| 7 |
Correct |
19 ms |
8048 KB |
Output is correct |
| 8 |
Correct |
20 ms |
10096 KB |
Output is correct |
| 9 |
Correct |
23 ms |
10888 KB |
Output is correct |
| 10 |
Correct |
22 ms |
10992 KB |
Output is correct |
| 11 |
Correct |
19 ms |
9384 KB |
Output is correct |
| 12 |
Correct |
1 ms |
212 KB |
Output is correct |
| 13 |
Correct |
1 ms |
332 KB |
Output is correct |
| 14 |
Correct |
1 ms |
332 KB |
Output is correct |
| 15 |
Correct |
0 ms |
212 KB |
Output is correct |
| 16 |
Correct |
1 ms |
340 KB |
Output is correct |
| 17 |
Correct |
1 ms |
340 KB |
Output is correct |
| 18 |
Correct |
1 ms |
332 KB |
Output is correct |
| 19 |
Correct |
0 ms |
212 KB |
Output is correct |
| 20 |
Correct |
1 ms |
340 KB |
Output is correct |
| 21 |
Correct |
1 ms |
340 KB |
Output is correct |
| 22 |
Correct |
1 ms |
212 KB |
Output is correct |
| 23 |
Correct |
1 ms |
332 KB |
Output is correct |
| 24 |
Correct |
1 ms |
328 KB |
Output is correct |
| 25 |
Correct |
1 ms |
340 KB |
Output is correct |
| 26 |
Correct |
0 ms |
340 KB |
Output is correct |
| 27 |
Correct |
1 ms |
340 KB |
Output is correct |
| 28 |
Correct |
1 ms |
212 KB |
Output is correct |
| 29 |
Correct |
0 ms |
340 KB |
Output is correct |
| 30 |
Correct |
1 ms |
212 KB |
Output is correct |
| 31 |
Correct |
1 ms |
328 KB |
Output is correct |
| 32 |
Correct |
1 ms |
212 KB |
Output is correct |
| 33 |
Correct |
1 ms |
212 KB |
Output is correct |
| 34 |
Correct |
1 ms |
212 KB |
Output is correct |
| 35 |
Correct |
1 ms |
332 KB |
Output is correct |
| 36 |
Correct |
1 ms |
332 KB |
Output is correct |
| 37 |
Correct |
1 ms |
328 KB |
Output is correct |
| 38 |
Correct |
1 ms |
340 KB |
Output is correct |
| 39 |
Correct |
1 ms |
340 KB |
Output is correct |
| 40 |
Correct |
1 ms |
340 KB |
Output is correct |
| 41 |
Correct |
1 ms |
212 KB |
Output is correct |
| 42 |
Correct |
1 ms |
340 KB |
Output is correct |
| 43 |
Correct |
1 ms |
332 KB |
Output is correct |
| 44 |
Correct |
0 ms |
336 KB |
Output is correct |
| 45 |
Correct |
1 ms |
340 KB |
Output is correct |
| 46 |
Correct |
0 ms |
340 KB |
Output is correct |
| 47 |
Correct |
1 ms |
340 KB |
Output is correct |
| 48 |
Correct |
1 ms |
212 KB |
Output is correct |
| 49 |
Correct |
1 ms |
340 KB |
Output is correct |
| 50 |
Correct |
0 ms |
340 KB |
Output is correct |
| 51 |
Correct |
1 ms |
340 KB |
Output is correct |
| 52 |
Correct |
1 ms |
340 KB |
Output is correct |
| 53 |
Correct |
1 ms |
212 KB |
Output is correct |
| 54 |
Correct |
1 ms |
340 KB |
Output is correct |
