func_code_string: #include <bits/stdc++.h>   using namespace std;   #define IOS ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0)   #define INP(arr,n) for(int a=0;a<n;a++)cin>>arr[a]   #define OTP(arr,n) for(int a=0;a<n;a++)cout<<arr[a]<<      #define ll long long int   #define pb(v,a) v.push_back(a)   int main() {   IOS;int t = 0;cin >> t;   while (t--) {       ll n = 0;cin >> n;       ll arr[n];INP(arr,n);       cout <<  0  ;       for (ll a = 1;a < n;a++) {           ll x = 0,y = 1;           bitset <64> bs(arr[a - 1]);           bitset <64> bs2(arr[a]);           for (int b = 0;b < 64;b++,y *= 2)               bs2[b] == 0 && bs[b] == 1 ? x += y,arr[a] += y: x = x;           cout << x <<    ;       }       cout <<   n ;   }   }