#include <iostream>
#include <vector>
bool check_arr(int n, std::vector<int> &line, int crazy) {
if (crazy == line.back()) return false;
for (int i = n-1; i >= 0; i--) {
if (line[i] == crazy) return true;
if (i+1 == line[i]) continue;
return false;
}
return false;
}
int solve(int n, std::vector<int> &line) {
int valid = 0;
for (int i = 1; i <= n; i++) {
if (check_arr(n, line, i)) {
if (!valid) { valid = i; continue; }
return 0;
}
}
return valid;
}
int main() {
std::ios_base::sync_with_stdio(false), std::cin.tie(nullptr), std::cout.tie(nullptr);
int _; std::cin >> _; while (_--) {
int n; std::cin >> n; std::vector<int> line(n); for (int i = 0; i < n; i++) std::cin >> line[i];
std::cout << solve(n, line) << '\n';
}
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
0 ms |
344 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
