Compilare: user.cpp: In function ‘int main(int, const char**)’: user.cpp:30:28: warning: ‘y’ may be used uninitialized in this function [-Wmaybe-uninitialized] if( arr[x] > arr[y] ) { std::swap( x, y ); } ^ user.cpp:31:28: warning: ‘z’ may be used uninitialized in this function [-Wmaybe-uninitialized] if( arr[x] > arr[z] ) { std::swap( x, z ); } ^