문제
풀이
#include <iostream>
#include <vector>
using namespace std;
bool solve(void) {
int n; cin >> n;
vector<int> a(n+1, 0);
for (int i=1; i<=n; i++) cin >> a[i];
if (n != (n & -n)) return false;
for (int i=1; i<=n; i<<=1) {
if (!a[i]) return false;
}
return true;
}
int main(void) {
ios::sync_with_stdio(false);
cin.tie(nullptr);
cout << (solve() ? "Yes" : "No");
return 0;
}