Compilare: user.cpp: In function ‘void latime()’: user.cpp:34:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a[p].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:51:7: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^