Submission #546229

#	Time	Username	Problem	Language	Result	Execution time	Memory
546229		sidon	Crazy old lady (IZhO13_crazy)	C++17	100 / 100	31 ms	352 KiB

crazy

#include <bits/stdc++.h>
using namespace std;

int main() {
	ios::sync_with_stdio(0), cin.tie(0);
	int T; cin >> T;
	while(T--) {
		int N; cin >> N;
		int p[N]; for(int &i : p) cin >> i, --i;
		int ans = N;

		for(int i = N; i--; ) {
			bool vis[N] {}, ok = 1;
			vis[*p] = 1;

			for(int j = 1; j < N; vis[p[j++]] = 1) {
				int k = j - (j <= i);
				if(!vis[k] && p[j] != k) ok = 0;
			}
			if(ok && ans >= 0)
				ans = ans == N ? i : -1;
		}
		cout << (ans % N) + 1 << '\n';
	}
}

• Subtask 1: 100 / 100