#include <bits/stdc++.h>
using namespace std;
using i64 = long long;
using u64 = unsigned long long;
using ld = long double;
using ii = pair<int, int>;
bool subseq(string& a, string& b) {
int n = size(a);
vector<bool> pre(n + 1);
bool suf = true;
pre[0] = true;
for(int i = 1; i <= n; ++i) pre[i] = pre[i - 1] && a[i - 1] == b[i - 1];
if(pre.back()) return true;
for(int i = n - 1; i >= 0; --i) {
suf = suf && a[i] == b[i + 1];
if(pre[i] && suf) return true;
}
return suf;
}
void solve() {
string s;
int n;
cin >> n >> s;
if(~n & 1) {
cout << "NOT POSSIBLE\n";
return;
}
string a = s.substr(0, n / 2) + s.substr(0, n / 2);
string b = s.substr(n / 2 + 1) + s.substr(n / 2 + 1);
if(subseq(a, s)) {
if(a == b || !subseq(b, s)) cout << s.substr(0, n / 2) << '\n';
else cout << "NOT UNIQUE\n";
} else if(subseq(b, s)) cout << s.substr(n / 2 + 1) << '\n';
else cout << "NOT POSSIBLE\n";
}
int main() {
ios_base :: sync_with_stdio(false);
cin.tie(0);
int t = 1;
// cin >> t;
while(t--) solve();
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
212 KB |
Output is correct |
| 2 |
Correct |
0 ms |
212 KB |
Output is correct |
| 3 |
Correct |
0 ms |
212 KB |
Output is correct |
| 4 |
Correct |
0 ms |
212 KB |
Output is correct |
| 5 |
Correct |
0 ms |
212 KB |
Output is correct |
| 6 |
Correct |
0 ms |
212 KB |
Output is correct |
| 7 |
Correct |
1 ms |
212 KB |
Output is correct |
| 8 |
Correct |
0 ms |
212 KB |
Output is correct |
| 9 |
Correct |
1 ms |
212 KB |
Output is correct |
| 10 |
Correct |
0 ms |
212 KB |
Output is correct |
| 11 |
Correct |
0 ms |
212 KB |
Output is correct |
| 12 |
Correct |
0 ms |
212 KB |
Output is correct |
| 13 |
Correct |
1 ms |
260 KB |
Output is correct |
| 14 |
Correct |
1 ms |
212 KB |
Output is correct |
| 15 |
Correct |
0 ms |
212 KB |
Output is correct |
| 16 |
Correct |
0 ms |
212 KB |
Output is correct |
| 17 |
Correct |
0 ms |
212 KB |
Output is correct |
| 18 |
Correct |
0 ms |
212 KB |
Output is correct |
| 19 |
Correct |
0 ms |
212 KB |
Output is correct |
| 20 |
Correct |
0 ms |
212 KB |
Output is correct |
| 21 |
Correct |
0 ms |
212 KB |
Output is correct |
| 22 |
Correct |
1 ms |
212 KB |
Output is correct |
| 23 |
Correct |
1 ms |
212 KB |
Output is correct |
| 24 |
Correct |
0 ms |
212 KB |
Output is correct |
| 25 |
Correct |
1 ms |
288 KB |
Output is correct |
| 26 |
Correct |
0 ms |
212 KB |
Output is correct |
| 27 |
Correct |
0 ms |
212 KB |
Output is correct |
| 28 |
Correct |
1 ms |
212 KB |
Output is correct |
| 29 |
Correct |
0 ms |
212 KB |
Output is correct |
| 30 |
Correct |
0 ms |
212 KB |
Output is correct |
| 31 |
Correct |
1 ms |
212 KB |
Output is correct |
| 32 |
Correct |
1 ms |
320 KB |
Output is correct |
| 33 |
Correct |
0 ms |
212 KB |
Output is correct |
| 34 |
Correct |
0 ms |
212 KB |
Output is correct |
| 35 |
Correct |
0 ms |
212 KB |
Output is correct |
| 36 |
Correct |
1 ms |
212 KB |
Output is correct |
| 37 |
Correct |
1 ms |
212 KB |
Output is correct |
| 38 |
Correct |
1 ms |
212 KB |
Output is correct |
| 39 |
Correct |
1 ms |
212 KB |
Output is correct |
| 40 |
Correct |
1 ms |
212 KB |
Output is correct |
| 41 |
Correct |
0 ms |
212 KB |
Output is correct |
| 42 |
Correct |
0 ms |
212 KB |
Output is correct |
| 43 |
Correct |
0 ms |
212 KB |
Output is correct |
| 44 |
Correct |
1 ms |
212 KB |
Output is correct |
| 45 |
Correct |
1 ms |
212 KB |
Output is correct |
| 46 |
Correct |
1 ms |
320 KB |
Output is correct |
| 47 |
Correct |
0 ms |
212 KB |
Output is correct |
| 48 |
Correct |
1 ms |
320 KB |
Output is correct |
| 49 |
Correct |
1 ms |
212 KB |
Output is correct |
| 50 |
Correct |
1 ms |
212 KB |
Output is correct |
| 51 |
Correct |
1 ms |
212 KB |
Output is correct |
| 52 |
Correct |
0 ms |
212 KB |
Output is correct |
| 53 |
Correct |
1 ms |
324 KB |
Output is correct |
| 54 |
Correct |
1 ms |
212 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
18 ms |
8164 KB |
Output is correct |
| 2 |
Correct |
19 ms |
8152 KB |
Output is correct |
| 3 |
Correct |
20 ms |
8172 KB |
Output is correct |
| 4 |
Correct |
19 ms |
8152 KB |
Output is correct |
| 5 |
Correct |
19 ms |
8152 KB |
Output is correct |
| 6 |
Correct |
3 ms |
2416 KB |
Output is correct |
| 7 |
Correct |
13 ms |
8160 KB |
Output is correct |
| 8 |
Correct |
16 ms |
7288 KB |
Output is correct |
| 9 |
Correct |
16 ms |
8184 KB |
Output is correct |
| 10 |
Correct |
17 ms |
8184 KB |
Output is correct |
| 11 |
Correct |
14 ms |
6776 KB |
Output is correct |
| 12 |
Correct |
0 ms |
212 KB |
Output is correct |
| 13 |
Correct |
1 ms |
212 KB |
Output is correct |
| 14 |
Correct |
1 ms |
212 KB |
Output is correct |
| 15 |
Correct |
0 ms |
212 KB |
Output is correct |
| 16 |
Correct |
0 ms |
212 KB |
Output is correct |
| 17 |
Correct |
0 ms |
212 KB |
Output is correct |
| 18 |
Correct |
0 ms |
212 KB |
Output is correct |
| 19 |
Correct |
0 ms |
212 KB |
Output is correct |
| 20 |
Correct |
0 ms |
212 KB |
Output is correct |
| 21 |
Correct |
0 ms |
212 KB |
Output is correct |
| 22 |
Correct |
0 ms |
212 KB |
Output is correct |
| 23 |
Correct |
0 ms |
212 KB |
Output is correct |
| 24 |
Correct |
1 ms |
212 KB |
Output is correct |
| 25 |
Correct |
1 ms |
212 KB |
Output is correct |
| 26 |
Correct |
0 ms |
212 KB |
Output is correct |
| 27 |
Correct |
0 ms |
212 KB |
Output is correct |
| 28 |
Correct |
1 ms |
212 KB |
Output is correct |
| 29 |
Correct |
0 ms |
212 KB |
Output is correct |
| 30 |
Correct |
0 ms |
212 KB |
Output is correct |
| 31 |
Correct |
0 ms |
212 KB |
Output is correct |
| 32 |
Correct |
1 ms |
212 KB |
Output is correct |
| 33 |
Correct |
0 ms |
212 KB |
Output is correct |
| 34 |
Correct |
1 ms |
212 KB |
Output is correct |
| 35 |
Correct |
0 ms |
212 KB |
Output is correct |
| 36 |
Correct |
1 ms |
212 KB |
Output is correct |
| 37 |
Correct |
1 ms |
212 KB |
Output is correct |
| 38 |
Correct |
0 ms |
212 KB |
Output is correct |
| 39 |
Correct |
1 ms |
212 KB |
Output is correct |
| 40 |
Correct |
1 ms |
212 KB |
Output is correct |
| 41 |
Correct |
0 ms |
212 KB |
Output is correct |
| 42 |
Correct |
1 ms |
212 KB |
Output is correct |
| 43 |
Correct |
0 ms |
212 KB |
Output is correct |
| 44 |
Correct |
1 ms |
212 KB |
Output is correct |
| 45 |
Correct |
0 ms |
320 KB |
Output is correct |
| 46 |
Correct |
1 ms |
320 KB |
Output is correct |
| 47 |
Correct |
0 ms |
212 KB |
Output is correct |
| 48 |
Correct |
0 ms |
212 KB |
Output is correct |
| 49 |
Correct |
0 ms |
212 KB |
Output is correct |
| 50 |
Correct |
0 ms |
212 KB |
Output is correct |
| 51 |
Correct |
1 ms |
212 KB |
Output is correct |
| 52 |
Correct |
0 ms |
212 KB |
Output is correct |
| 53 |
Correct |
0 ms |
316 KB |
Output is correct |
| 54 |
Correct |
1 ms |
340 KB |
Output is correct |
