#include <bits/stdc++.h>
#define int long long
#define debug(x) if(0) cout << #x << " is " << x << "\n";
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
using namespace std;
main(){
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int N;
cin >> N;
string S;
cin >> S;
if(N % 2 == 0){
cout << "NOT POSSIBLE";
return 0;
}
int X = (N - 1) / 2;
char curstr[N - 1];
char rightneow[X];
bool hvone = false;
int numcorrect = 0;
for(int i=1;i<N;i++){
curstr[i - 1] = S[i];
}
for(int i=0;i<X;i++){
if(curstr[i] == curstr[i + X]) numcorrect ++;
}
int numcorwithfunny = 0;
if(numcorrect == X && !hvone){
for(int j=0;j<X;j++) rightneow[j] = curstr[j];
for(int j=0;j<X;j++) if(rightneow[j] == curstr[j]) numcorwithfunny ++;
hvone = true;
}
for(int i=0;i<N - 1;i++){
//change curstr[i] to S[i]
if(i < X){
if(curstr[i] == curstr[i + X]){
if(S[i] != curstr[i + X]) numcorrect --;
}
else if(S[i] == curstr[i + X]) numcorrect ++;
}
else{
if(curstr[i] == curstr[i - X]){
if(S[i] != curstr[i - X]) numcorrect --;
}
else if(S[i] == curstr[i - X]) numcorrect ++;
}
if(hvone && i < X){
if(curstr[i] == rightneow[i]){
if(S[i] != rightneow[i]) numcorwithfunny --;
}
else if(S[i] == rightneow[i]) numcorwithfunny ++;
}
curstr[i] = S[i];
if(numcorrect == X && hvone){
debug(i);
debug(curstr[2]);
if(numcorwithfunny != X){
cout << "NOT UNIQUE";
return 0;
}
}
if(numcorrect == X && !hvone){
for(int j=0;j<X;j++) rightneow[j] = curstr[j];
for(int j=0;j<X;j++) if(rightneow[j] == curstr[j]) numcorwithfunny ++;
hvone = true;
}
}
if(hvone) for(int i=0;i<X;i++) cout << rightneow[i];
else cout << "NOT POSSIBLE";
}
Compilation message
friends.cpp:7:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
7 | main(){
| ^~~~
| # |
결과 |
실행 시간 |
메모리 |
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 |
1 ms |
348 KB |
Output is correct |
| 7 |
Correct |
0 ms |
348 KB |
Output is correct |
| 8 |
Correct |
1 ms |
348 KB |
Output is correct |
| 9 |
Correct |
0 ms |
452 KB |
Output is correct |
| 10 |
Correct |
0 ms |
348 KB |
Output is correct |
| 11 |
Correct |
0 ms |
348 KB |
Output is correct |
| 12 |
Correct |
1 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 |
0 ms |
428 KB |
Output is correct |
| 19 |
Correct |
0 ms |
348 KB |
Output is correct |
| 20 |
Correct |
0 ms |
348 KB |
Output is correct |
| 21 |
Correct |
1 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 |
1 ms |
452 KB |
Output is correct |
| 27 |
Correct |
0 ms |
348 KB |
Output is correct |
| 28 |
Correct |
0 ms |
456 KB |
Output is correct |
| 29 |
Correct |
0 ms |
348 KB |
Output is correct |
| 30 |
Correct |
0 ms |
448 KB |
Output is correct |
| 31 |
Correct |
1 ms |
348 KB |
Output is correct |
| 32 |
Correct |
0 ms |
464 KB |
Output is correct |
| 33 |
Correct |
1 ms |
348 KB |
Output is correct |
| 34 |
Correct |
0 ms |
348 KB |
Output is correct |
| 35 |
Correct |
0 ms |
348 KB |
Output is correct |
| 36 |
Correct |
1 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 |
0 ms |
348 KB |
Output is correct |
| 42 |
Correct |
0 ms |
348 KB |
Output is correct |
| 43 |
Correct |
0 ms |
344 KB |
Output is correct |
| 44 |
Correct |
0 ms |
348 KB |
Output is correct |
| 45 |
Correct |
1 ms |
344 KB |
Output is correct |
| 46 |
Correct |
0 ms |
348 KB |
Output is correct |
| 47 |
Correct |
1 ms |
348 KB |
Output is correct |
| 48 |
Correct |
0 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 |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
26 ms |
6388 KB |
Output is correct |
| 2 |
Correct |
26 ms |
6336 KB |
Output is correct |
| 3 |
Correct |
44 ms |
6384 KB |
Output is correct |
| 4 |
Correct |
26 ms |
6384 KB |
Output is correct |
| 5 |
Correct |
44 ms |
6388 KB |
Output is correct |
| 6 |
Correct |
3 ms |
2552 KB |
Output is correct |
| 7 |
Correct |
30 ms |
6252 KB |
Output is correct |
| 8 |
Correct |
9 ms |
4860 KB |
Output is correct |
| 9 |
Correct |
23 ms |
5632 KB |
Output is correct |
| 10 |
Correct |
34 ms |
5888 KB |
Output is correct |
| 11 |
Correct |
8 ms |
6128 KB |
Output is correct |
| 12 |
Correct |
1 ms |
348 KB |
Output is correct |
| 13 |
Correct |
0 ms |
348 KB |
Output is correct |
| 14 |
Correct |
0 ms |
456 KB |
Output is correct |
| 15 |
Correct |
0 ms |
600 KB |
Output is correct |
| 16 |
Correct |
0 ms |
348 KB |
Output is correct |
| 17 |
Correct |
0 ms |
348 KB |
Output is correct |
| 18 |
Correct |
0 ms |
348 KB |
Output is correct |
| 19 |
Correct |
1 ms |
344 KB |
Output is correct |
| 20 |
Correct |
1 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 |
1 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 |
1 ms |
352 KB |
Output is correct |
| 27 |
Correct |
0 ms |
356 KB |
Output is correct |
| 28 |
Correct |
0 ms |
348 KB |
Output is correct |
| 29 |
Correct |
0 ms |
468 KB |
Output is correct |
| 30 |
Correct |
0 ms |
348 KB |
Output is correct |
| 31 |
Correct |
0 ms |
356 KB |
Output is correct |
| 32 |
Correct |
0 ms |
464 KB |
Output is correct |
| 33 |
Correct |
0 ms |
360 KB |
Output is correct |
| 34 |
Correct |
0 ms |
352 KB |
Output is correct |
| 35 |
Correct |
0 ms |
352 KB |
Output is correct |
| 36 |
Correct |
1 ms |
352 KB |
Output is correct |
| 37 |
Correct |
0 ms |
344 KB |
Output is correct |
| 38 |
Correct |
1 ms |
348 KB |
Output is correct |
| 39 |
Correct |
0 ms |
532 KB |
Output is correct |
| 40 |
Correct |
0 ms |
348 KB |
Output is correct |
| 41 |
Correct |
0 ms |
456 KB |
Output is correct |
| 42 |
Correct |
0 ms |
348 KB |
Output is correct |
| 43 |
Correct |
0 ms |
456 KB |
Output is correct |
| 44 |
Correct |
0 ms |
348 KB |
Output is correct |
| 45 |
Correct |
0 ms |
348 KB |
Output is correct |
| 46 |
Correct |
1 ms |
348 KB |
Output is correct |
| 47 |
Correct |
1 ms |
344 KB |
Output is correct |
| 48 |
Correct |
0 ms |
348 KB |
Output is correct |
| 49 |
Correct |
0 ms |
456 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 |
1 ms |
348 KB |
Output is correct |
