#include <iostream> #include <cstdio> #include <algorithm> using namespace std; int main() { int t; cin>>t; for(int i=0;i<t;i++){ int n; cin>>n; int res=0; for(int j=0;j<n;j++){ int temp; cin>>temp; res^=temp; } cout<<res<<endl; } return 0; } |
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