Compilare: user.cpp: In function ‘int cmp2(std::pair<int, int>, std::pair<int, int>)’: user.cpp:24:15: warning: the address of ‘long long int det(std::pair<int, int>, std::pair<int, int>, std::pair<int, int>)’ will never be NULL [-Waddress] if(det != 0){ ^ user.cpp:23:15: warning: unused variable ‘d’ [-Wunused-variable] long long d = det(orig, a, b); ^ user.cpp: In function ‘void build(int, int, int)’: user.cpp:41:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < arb[2 * nod].size(); i++){ ^ user.cpp:44:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < arb[2 * nod + 1].size(); i++){ ^ user.cpp: In function ‘int query(int, int, int, std::pair<int, int>, std::pair<int, int>)’: user.cpp:114:1: warning: control reaches end of non-void function [-Wreturn-type] } ^