Fake Numbers

#include<iostream>
using namespace std;
#define Max 1000
int s[Max];
int main(){
	int n, i, j, k;
	bool b = false;
	cin >> n;
	for(i = 0; i < n; ++i)
		cin >> s[i];
	for(i = 0; i < n; ++i){
		for(j = 0; j < n; ++j){
			if(j % 2 == 0) s[j] = (s[j] + 1) % n;
			else s[j] = (s[j] - 1 >= 0 ? s[j] - 1 : s[j] + n - 1);
		}
		for(k = 0; k < n; ++k){
			if(s[k] != k) break;
		}
		if(k == n) {b = true; break;}
	}
	if(b) cout << "Yes" << endl;
	else cout << "No" << endl;
	return 0;
}