Compilare: user.cpp: In function ‘void dfs2(int, int)’: user.cpp:73:80: warning: suggest parentheses around assignment used as truth value [-Wparentheses] for ( int i = 1 ; ank [ nod ] [ i ] = ank [ ank [ nod ] [ i - 1 ] ] [ i - 1 ] ; ++ i ) ; ^ user.cpp: In function ‘bool query(int, int)’: user.cpp:100:9: warning: unused variable ‘kkt1’ [-Wunused-variable] int kkt1 = abs ( level [ lca ] - level [ a ] ) ; ^ user.cpp:101:9: warning: unused variable ‘kkt2’ [-Wunused-variable] int kkt2 = abs ( level [ lca ] - level [ b ] ) ; ^