Eroare de compilare: user.cpp:2:60: error: ‘__int64’ does not name a type std::ifstream i("clasic.in");std::ofstream o("clasic.out");__int64 T,N,x,R;main(){for(i>>T;T;--T){R=0;for(i>>N;N;--N)i>>x,R^=x;o<<R<<' ';}} ^ user.cpp:2:81: warning: ISO C++ forbids declaration of ‘main’ with no type [-Wreturn-type] std::ifstream i("clasic.in");std::ofstream o("clasic.out");__int64 T,N,x,R;main(){for(i>>T;T;--T){R=0;for(i>>N;N;--N)i>>x,R^=x;o<<R<<' ';}} ^ user.cpp: In function ‘int main()’: user.cpp:2:90: error: ‘T’ was not declared in this scope std::ifstream i("clasic.in");std::ofstream o("clasic.out");__int64 T,N,x,R;main(){for(i>>T;T;--T){R=0;for(i>>N;N;--N)i>>x,R^=x;o<<R<<' ';}} ^ user.cpp:2:99: error: ‘R’ was not declared in this scope std::ifstream i("clasic.in");std::ofstream o("clasic.out");__int64 T,N,x,R;main(){for(i>>T;T;--T){R=0;for(i>>N;N;--N)i>>x,R^=x;o<<R<<' ';}} ^ user.cpp:2:110: error: ‘N’ was not declared in this scope std::ifstream i("clasic.in");std::ofstream o("clasic.out");__int64 T,N,x,R;main(){for(i>>T;T;--T){R=0;for(i>>N;N;--N)i>>x,R^=x;o<<R<<' ';}} ^ user.cpp:2:121: error: ‘x’ was not declared in this scope std::ifstream i("clasic.in");std::ofstream o("clasic.out");__int64 T,N,x,R;main(){for(i>>T;T;--T){R=0;for(i>>N;N;--N)i>>x,R^=x;o<<R<<' ';}} ^