#include <bits/stdc++.h>
using namespace std;
#define int long long
mt19937_64 RNG(chrono::steady_clock::now().time_since_epoch().count());
string s;
bool check(string t, int l, int r) {
int pos = 0;
for(int i = l; i <= r; i++) {
if(pos != t.size() && t[pos] == s[i]) {
pos++;
}
}
return (pos == t.size());
}
void Solve() {
int n;
cin >> n;
cin >> s;
if(n % 2 == 0) {
cout << "NOT POSSIBLE\n";
return;
}
bool f1 = check(s.substr(0, n / 2), n / 2, n - 1), f2 = check(s.substr(n - n / 2, n / 2), 0, n / 2);
if(!f1 && !f2) {
cout << "NOT POSSIBLE\n";
}
else if(f1 && f2 && s.substr(0, n / 2) != s.substr(n - n / 2, n / 2)) {
cout << "NOT UNIQUE\n";
}
else if(f1) {
cout << s.substr(0, n / 2) << "\n";
}
else {
cout << s.substr(n - n / 2, n / 2) << "\n";
}
}
int32_t main() {
auto begin = std::chrono::high_resolution_clock::now();
ios_base::sync_with_stdio(0);
cin.tie(0);
int t = 1;
//cin >> t;
while(t--) {
Solve();
}
auto end = std::chrono::high_resolution_clock::now();
auto elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(end - begin);
cerr << "Time measured: " << elapsed.count() * 1e-9 << " seconds.\n";
return 0;
}
Compilation message
friends.cpp: In function 'bool check(std::string, long long int, long long int)':
friends.cpp:12:10: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
12 | if(pos != t.size() && t[pos] == s[i]) {
| ~~~~^~~~~~~~~~~
friends.cpp:16:14: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
16 | return (pos == t.size());
| ~~~~^~~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
1 ms |
324 KB |
Output is correct |
| 2 |
Correct |
0 ms |
208 KB |
Output is correct |
| 3 |
Correct |
0 ms |
324 KB |
Output is correct |
| 4 |
Correct |
1 ms |
208 KB |
Output is correct |
| 5 |
Correct |
1 ms |
208 KB |
Output is correct |
| 6 |
Correct |
0 ms |
208 KB |
Output is correct |
| 7 |
Correct |
0 ms |
208 KB |
Output is correct |
| 8 |
Correct |
0 ms |
208 KB |
Output is correct |
| 9 |
Correct |
0 ms |
208 KB |
Output is correct |
| 10 |
Correct |
0 ms |
208 KB |
Output is correct |
| 11 |
Correct |
0 ms |
208 KB |
Output is correct |
| 12 |
Correct |
0 ms |
208 KB |
Output is correct |
| 13 |
Correct |
1 ms |
208 KB |
Output is correct |
| 14 |
Correct |
0 ms |
208 KB |
Output is correct |
| 15 |
Correct |
0 ms |
208 KB |
Output is correct |
| 16 |
Correct |
0 ms |
208 KB |
Output is correct |
| 17 |
Correct |
0 ms |
208 KB |
Output is correct |
| 18 |
Correct |
0 ms |
208 KB |
Output is correct |
| 19 |
Correct |
0 ms |
208 KB |
Output is correct |
| 20 |
Correct |
1 ms |
208 KB |
Output is correct |
| 21 |
Correct |
0 ms |
208 KB |
Output is correct |
| 22 |
Correct |
0 ms |
208 KB |
Output is correct |
| 23 |
Correct |
0 ms |
208 KB |
Output is correct |
| 24 |
Correct |
0 ms |
208 KB |
Output is correct |
| 25 |
Correct |
0 ms |
208 KB |
Output is correct |
| 26 |
Correct |
1 ms |
208 KB |
Output is correct |
| 27 |
Correct |
0 ms |
208 KB |
Output is correct |
| 28 |
Correct |
1 ms |
208 KB |
Output is correct |
| 29 |
Correct |
1 ms |
292 KB |
Output is correct |
| 30 |
Correct |
1 ms |
208 KB |
Output is correct |
| 31 |
Correct |
1 ms |
320 KB |
Output is correct |
| 32 |
Correct |
1 ms |
208 KB |
Output is correct |
| 33 |
Correct |
1 ms |
208 KB |
Output is correct |
| 34 |
Correct |
0 ms |
208 KB |
Output is correct |
| 35 |
Correct |
0 ms |
208 KB |
Output is correct |
| 36 |
Correct |
1 ms |
208 KB |
Output is correct |
| 37 |
Correct |
0 ms |
320 KB |
Output is correct |
| 38 |
Correct |
0 ms |
208 KB |
Output is correct |
| 39 |
Correct |
0 ms |
208 KB |
Output is correct |
| 40 |
Correct |
0 ms |
208 KB |
Output is correct |
| 41 |
Correct |
0 ms |
208 KB |
Output is correct |
| 42 |
Correct |
0 ms |
208 KB |
Output is correct |
| 43 |
Correct |
0 ms |
208 KB |
Output is correct |
| 44 |
Correct |
0 ms |
208 KB |
Output is correct |
| 45 |
Correct |
0 ms |
320 KB |
Output is correct |
| 46 |
Correct |
0 ms |
208 KB |
Output is correct |
| 47 |
Correct |
0 ms |
208 KB |
Output is correct |
| 48 |
Correct |
0 ms |
208 KB |
Output is correct |
| 49 |
Correct |
1 ms |
208 KB |
Output is correct |
| 50 |
Correct |
1 ms |
208 KB |
Output is correct |
| 51 |
Correct |
0 ms |
208 KB |
Output is correct |
| 52 |
Correct |
1 ms |
208 KB |
Output is correct |
| 53 |
Correct |
1 ms |
208 KB |
Output is correct |
| 54 |
Correct |
1 ms |
208 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
7 ms |
6220 KB |
Output is correct |
| 2 |
Correct |
11 ms |
6212 KB |
Output is correct |
| 3 |
Correct |
8 ms |
6168 KB |
Output is correct |
| 4 |
Correct |
9 ms |
6184 KB |
Output is correct |
| 5 |
Correct |
9 ms |
6160 KB |
Output is correct |
| 6 |
Correct |
5 ms |
4340 KB |
Output is correct |
| 7 |
Correct |
8 ms |
6212 KB |
Output is correct |
| 8 |
Correct |
7 ms |
5612 KB |
Output is correct |
| 9 |
Correct |
10 ms |
5532 KB |
Output is correct |
| 10 |
Correct |
6 ms |
5516 KB |
Output is correct |
| 11 |
Correct |
6 ms |
4324 KB |
Output is correct |
| 12 |
Correct |
0 ms |
208 KB |
Output is correct |
| 13 |
Correct |
0 ms |
208 KB |
Output is correct |
| 14 |
Correct |
0 ms |
208 KB |
Output is correct |
| 15 |
Correct |
1 ms |
316 KB |
Output is correct |
| 16 |
Correct |
0 ms |
208 KB |
Output is correct |
| 17 |
Correct |
1 ms |
208 KB |
Output is correct |
| 18 |
Correct |
1 ms |
208 KB |
Output is correct |
| 19 |
Correct |
0 ms |
208 KB |
Output is correct |
| 20 |
Correct |
1 ms |
208 KB |
Output is correct |
| 21 |
Correct |
0 ms |
208 KB |
Output is correct |
| 22 |
Correct |
0 ms |
208 KB |
Output is correct |
| 23 |
Correct |
1 ms |
208 KB |
Output is correct |
| 24 |
Correct |
1 ms |
208 KB |
Output is correct |
| 25 |
Correct |
0 ms |
320 KB |
Output is correct |
| 26 |
Correct |
0 ms |
208 KB |
Output is correct |
| 27 |
Correct |
0 ms |
320 KB |
Output is correct |
| 28 |
Correct |
0 ms |
208 KB |
Output is correct |
| 29 |
Correct |
1 ms |
208 KB |
Output is correct |
| 30 |
Correct |
0 ms |
208 KB |
Output is correct |
| 31 |
Correct |
1 ms |
208 KB |
Output is correct |
| 32 |
Correct |
0 ms |
208 KB |
Output is correct |
| 33 |
Correct |
1 ms |
208 KB |
Output is correct |
| 34 |
Correct |
1 ms |
208 KB |
Output is correct |
| 35 |
Correct |
1 ms |
208 KB |
Output is correct |
| 36 |
Correct |
1 ms |
208 KB |
Output is correct |
| 37 |
Correct |
1 ms |
208 KB |
Output is correct |
| 38 |
Correct |
1 ms |
208 KB |
Output is correct |
| 39 |
Correct |
1 ms |
208 KB |
Output is correct |
| 40 |
Correct |
1 ms |
208 KB |
Output is correct |
| 41 |
Correct |
0 ms |
208 KB |
Output is correct |
| 42 |
Correct |
0 ms |
208 KB |
Output is correct |
| 43 |
Correct |
0 ms |
316 KB |
Output is correct |
| 44 |
Correct |
0 ms |
208 KB |
Output is correct |
| 45 |
Correct |
0 ms |
208 KB |
Output is correct |
| 46 |
Correct |
0 ms |
208 KB |
Output is correct |
| 47 |
Correct |
0 ms |
208 KB |
Output is correct |
| 48 |
Correct |
1 ms |
320 KB |
Output is correct |
| 49 |
Correct |
0 ms |
324 KB |
Output is correct |
| 50 |
Correct |
0 ms |
208 KB |
Output is correct |
| 51 |
Correct |
0 ms |
208 KB |
Output is correct |
| 52 |
Correct |
0 ms |
208 KB |
Output is correct |
| 53 |
Correct |
1 ms |
208 KB |
Output is correct |
| 54 |
Correct |
0 ms |
316 KB |
Output is correct |
