A题Wa 求助
#include <cstdio>
#include <iostream>
using namespace std;
typedef long long ll;
ll n, k, s, a, sum;
int main()
{
scanf("%lld%lld%lld", &n, &k, &s);
sum = (1 << n) - 1;
for(ll i = 1; i <= k; i++)
{
scanf("%lld", &a);
// cout << (1 << a - 1) << endl;
sum -= (1 << a - 1);
}
sum = sum & s;
if(sum == s) printf("YES\n");
else printf("NO\n");
return 0;
} 
