#include <iostream>
#include <vector>
int solve(int n, std::vector<int> &line) {
if (n == 2) return 0;
for (int i = line.back()-1; i >= 0; i--) {
if (line[i] == i+1) continue;
return line[i];
}
return 1;
}
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 |
Correct |
0 ms |
348 KB |
Output is correct |
| 2 |
Incorrect |
0 ms |
348 KB |
Output isn't correct |
| 3 |
Halted |
0 ms |
0 KB |
- |
