#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const string not_possible = "NOT POSSIBLE";
const string not_unique = "NOT UNIQUE";
const ll MOD = 1645333507;
const ll BASE = 137;
ll buildHash(int i, int len, string s) {
ll result = 0;
while (len--) result = (result * BASE + ll(s[i] - 'A')) % MOD;
return result;
}
bool test(string a, string b) {
vector<bool> pref(b.size(), false), suf(b.size(), false);
for (int i = 0; i < a.size(); i++) {
if (a[i] == b[i])
pref[i] = true;
else
break;
}
for (int i = a.size() - 1; i >= 0; i--) {
if (a[i] == b[i + 1])
suf[i + 1] = true;
else
break;
}
for (int i = 0; i < b.size(); i++)
if ((i == 0 || pref[i - 1]) && (i == (b.size() - 1) || suf[i + 1]))
return true;
return false;
}
int main() {
int n, m;
string s;
cin >> n >> s;
m = n / 2;
if (n < 3 || n != m * 2 + 1) {
cout << not_possible << endl;
return 0;
}
bool equalParts = 1;
for (int i = 0; i < m; i++)
if (s[i] != s[m + 1 + i]) equalParts = false;
if (equalParts) {
cout << s.substr(0, m) << endl;
return 0;
}
bool ansl = test(s.substr(0, m), s.substr(m, m + 1));
bool ansr = test(s.substr(m + 1, m), s.substr(0, m + 1));
if (ansl && ansr)
cout << not_unique << endl;
else if (ansl)
cout << s.substr(0, m) << endl;
else if (ansr)
cout << s.substr(m + 1, m) << endl;
else
cout << not_possible << endl;
}
Compilation message
friends.cpp: In function 'bool test(std::__cxx11::string, std::__cxx11::string)':
friends.cpp:20:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 0; i < a.size(); i++) {
^
friends.cpp:34:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int i = 0; i < b.size(); i++)
^
friends.cpp:35:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if ((i == 0 || pref[i - 1]) && (i == (b.size() - 1) || suf[i + 1]))
^
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
2 ms |
248 KB |
Output is correct |
| 2 |
Correct |
2 ms |
352 KB |
Output is correct |
| 3 |
Correct |
2 ms |
352 KB |
Output is correct |
| 4 |
Correct |
2 ms |
404 KB |
Output is correct |
| 5 |
Correct |
2 ms |
456 KB |
Output is correct |
| 6 |
Correct |
2 ms |
456 KB |
Output is correct |
| 7 |
Correct |
2 ms |
604 KB |
Output is correct |
| 8 |
Correct |
2 ms |
604 KB |
Output is correct |
| 9 |
Correct |
2 ms |
604 KB |
Output is correct |
| 10 |
Correct |
2 ms |
604 KB |
Output is correct |
| 11 |
Correct |
2 ms |
604 KB |
Output is correct |
| 12 |
Correct |
2 ms |
604 KB |
Output is correct |
| 13 |
Correct |
2 ms |
604 KB |
Output is correct |
| 14 |
Correct |
2 ms |
604 KB |
Output is correct |
| 15 |
Correct |
2 ms |
604 KB |
Output is correct |
| 16 |
Correct |
2 ms |
604 KB |
Output is correct |
| 17 |
Correct |
2 ms |
604 KB |
Output is correct |
| 18 |
Correct |
2 ms |
604 KB |
Output is correct |
| 19 |
Correct |
2 ms |
604 KB |
Output is correct |
| 20 |
Correct |
1 ms |
604 KB |
Output is correct |
| 21 |
Correct |
2 ms |
604 KB |
Output is correct |
| 22 |
Correct |
2 ms |
604 KB |
Output is correct |
| 23 |
Correct |
2 ms |
604 KB |
Output is correct |
| 24 |
Correct |
2 ms |
604 KB |
Output is correct |
| 25 |
Correct |
2 ms |
604 KB |
Output is correct |
| 26 |
Correct |
2 ms |
604 KB |
Output is correct |
| 27 |
Correct |
1 ms |
604 KB |
Output is correct |
| 28 |
Correct |
1 ms |
604 KB |
Output is correct |
| 29 |
Correct |
2 ms |
604 KB |
Output is correct |
| 30 |
Correct |
1 ms |
604 KB |
Output is correct |
| 31 |
Correct |
2 ms |
604 KB |
Output is correct |
| 32 |
Correct |
2 ms |
604 KB |
Output is correct |
| 33 |
Correct |
2 ms |
604 KB |
Output is correct |
| 34 |
Correct |
2 ms |
604 KB |
Output is correct |
| 35 |
Correct |
1 ms |
604 KB |
Output is correct |
| 36 |
Correct |
2 ms |
604 KB |
Output is correct |
| 37 |
Correct |
2 ms |
604 KB |
Output is correct |
| 38 |
Correct |
1 ms |
604 KB |
Output is correct |
| 39 |
Correct |
1 ms |
604 KB |
Output is correct |
| 40 |
Correct |
2 ms |
604 KB |
Output is correct |
| 41 |
Correct |
2 ms |
604 KB |
Output is correct |
| 42 |
Correct |
1 ms |
604 KB |
Output is correct |
| 43 |
Correct |
2 ms |
604 KB |
Output is correct |
| 44 |
Correct |
2 ms |
604 KB |
Output is correct |
| 45 |
Correct |
2 ms |
604 KB |
Output is correct |
| 46 |
Correct |
2 ms |
620 KB |
Output is correct |
| 47 |
Correct |
1 ms |
620 KB |
Output is correct |
| 48 |
Correct |
2 ms |
620 KB |
Output is correct |
| 49 |
Correct |
2 ms |
620 KB |
Output is correct |
| 50 |
Correct |
2 ms |
620 KB |
Output is correct |
| 51 |
Correct |
2 ms |
620 KB |
Output is correct |
| 52 |
Correct |
2 ms |
620 KB |
Output is correct |
| 53 |
Correct |
2 ms |
620 KB |
Output is correct |
| 54 |
Correct |
2 ms |
620 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
84 ms |
5716 KB |
Output is correct |
| 2 |
Correct |
83 ms |
5804 KB |
Output is correct |
| 3 |
Correct |
81 ms |
5804 KB |
Output is correct |
| 4 |
Correct |
85 ms |
5804 KB |
Output is correct |
| 5 |
Correct |
85 ms |
5804 KB |
Output is correct |
| 6 |
Correct |
75 ms |
5804 KB |
Output is correct |
| 7 |
Correct |
77 ms |
5804 KB |
Output is correct |
| 8 |
Correct |
76 ms |
5804 KB |
Output is correct |
| 9 |
Correct |
78 ms |
5804 KB |
Output is correct |
| 10 |
Correct |
83 ms |
5804 KB |
Output is correct |
| 11 |
Correct |
68 ms |
5804 KB |
Output is correct |
| 12 |
Correct |
2 ms |
5804 KB |
Output is correct |
| 13 |
Correct |
2 ms |
5804 KB |
Output is correct |
| 14 |
Correct |
2 ms |
5804 KB |
Output is correct |
| 15 |
Correct |
1 ms |
5804 KB |
Output is correct |
| 16 |
Correct |
2 ms |
5804 KB |
Output is correct |
| 17 |
Correct |
2 ms |
5804 KB |
Output is correct |
| 18 |
Correct |
2 ms |
5804 KB |
Output is correct |
| 19 |
Correct |
2 ms |
5804 KB |
Output is correct |
| 20 |
Correct |
2 ms |
5804 KB |
Output is correct |
| 21 |
Correct |
2 ms |
5804 KB |
Output is correct |
| 22 |
Correct |
2 ms |
5804 KB |
Output is correct |
| 23 |
Correct |
2 ms |
5804 KB |
Output is correct |
| 24 |
Correct |
2 ms |
5804 KB |
Output is correct |
| 25 |
Correct |
2 ms |
5804 KB |
Output is correct |
| 26 |
Correct |
2 ms |
5804 KB |
Output is correct |
| 27 |
Correct |
2 ms |
5804 KB |
Output is correct |
| 28 |
Correct |
2 ms |
5804 KB |
Output is correct |
| 29 |
Correct |
1 ms |
5804 KB |
Output is correct |
| 30 |
Correct |
2 ms |
5804 KB |
Output is correct |
| 31 |
Correct |
1 ms |
5804 KB |
Output is correct |
| 32 |
Correct |
2 ms |
5804 KB |
Output is correct |
| 33 |
Correct |
1 ms |
5804 KB |
Output is correct |
| 34 |
Correct |
2 ms |
5804 KB |
Output is correct |
| 35 |
Correct |
1 ms |
5804 KB |
Output is correct |
| 36 |
Correct |
2 ms |
5804 KB |
Output is correct |
| 37 |
Correct |
2 ms |
5804 KB |
Output is correct |
| 38 |
Correct |
1 ms |
5804 KB |
Output is correct |
| 39 |
Correct |
2 ms |
5804 KB |
Output is correct |
| 40 |
Correct |
2 ms |
5804 KB |
Output is correct |
| 41 |
Correct |
2 ms |
5804 KB |
Output is correct |
| 42 |
Correct |
2 ms |
5804 KB |
Output is correct |
| 43 |
Correct |
1 ms |
5804 KB |
Output is correct |
| 44 |
Correct |
2 ms |
5804 KB |
Output is correct |
| 45 |
Correct |
1 ms |
5804 KB |
Output is correct |
| 46 |
Correct |
1 ms |
5804 KB |
Output is correct |
| 47 |
Correct |
1 ms |
5804 KB |
Output is correct |
| 48 |
Correct |
1 ms |
5804 KB |
Output is correct |
| 49 |
Correct |
1 ms |
5804 KB |
Output is correct |
| 50 |
Correct |
1 ms |
5804 KB |
Output is correct |
| 51 |
Correct |
1 ms |
5804 KB |
Output is correct |
| 52 |
Correct |
1 ms |
5804 KB |
Output is correct |
| 53 |
Correct |
1 ms |
5804 KB |
Output is correct |
| 54 |
Correct |
1 ms |
5804 KB |
Output is correct |
