Compilare: main.cpp: In function 'int cmp(ceva, ceva)': main.cpp:20:12: warning: statement has no effect [-Wunused-value] a.x<b.x; ~~~^~~~ main.cpp:22:12: warning: statement has no effect [-Wunused-value] a.y<b.y; ~~~^~~~ main.cpp:23:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^