Compilare: user.cpp: In function 'int query_eliminate(int, int, int)': user.cpp:12: warning: unused variable 'x' user.cpp: In function 'int remove(int, int, int)': user.cpp:68: warning: control reaches end of non-void function user.cpp: In function 'int build(int, int, int)': user.cpp:56: warning: control reaches end of non-void function user.cpp: In function 'int add_eliminate(int, int, int)': user.cpp:31: warning: control reaches end of non-void function