Submission #546230

#	Time	Username	Problem	Language	Result	Execution time	Memory
546230		sidon	Crazy old lady (IZhO13_crazy)	C++17	100 / 100	29 ms	212 KiB

crazy

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

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

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

			for(int j = 1; j < N; vis[p[j++]] = 1)
				if(!vis[j - (j <= i)] && p[j] != j - (j <= i)) ok = 0;

			if(ok && ans >= 0)
				ans = ans == N ? i : -1;
		}
		cout << (ans % N) + 1 << '\n';
	}
}

• Subtask 1: 100 / 100