Compilare: user.cpp: In constructor ‘SegTree::SegTree(int)’: user.cpp:23:31: warning: argument to ‘sizeof’ in ‘void* memset(void*, int, size_t)’ call is the same expression as the destination; did you mean to dereference it? [-Wsizeof-pointer-memaccess] memset( v , 0 , sizeof( v ) ); ^ user.cpp: In function ‘void DF1(int, int)’: user.cpp:65:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0 ; i < G[ nod ].size() ; i++ ) ^