Compilare: user.cpp: In function ‘void lee(int, int, int)’: user.cpp:33:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<vec[x].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:42:30: warning: unused variable ‘j’ [-Wunused-variable] int start, finish, n, m, i, j; ^