Compilare: user.cpp: In function ‘int main()’: user.cpp:42:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0 ;j < v[i].size() - 1 ;j++){ ^ user.cpp: In function ‘int binarysearch(int, int, int, int)’: user.cpp:24:1: warning: control reaches end of non-void function [-Wreturn-type] } ^