Permutation Check

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

#define int long long

signed main()
{
    int n;
    cin >> n;
    vector<int> a(n);
    for(int i = 0; i < n; i++){
        cin >> a[i];
    }
    sort(a.begin(), a.end());
    bool ok = true;
    for(int i = 0; i < n; i++){
        if(a[i] != (i + 1)){
            ok = false;
            break;
        }
    }
    cout << (ok ? "Yes" : "No") << endl;
}