func_code_string: #include<bits/stdc++.h>   using namespace std;      void solve(){    int n;    cin >> n;    int a[n];    for(int i=0;i<n;i++){     cin >> a[i];    }        vector<int> ans;    ans.push_back(0);        int current = a[0];    for(int i=1;i<n;i++){     int cans = (current|a[i])^a[i];     ans.push_back(cans);     current = current|a[i];    }        for(int i=0;i<n;i++){     cout << ans[i] <<    ;    }        cout << endl;   }      int main(){    int t=1;    cin >> t;    while(t--){     solve();    }   }