Compilare: user.cpp: In function ‘int main()’: user.cpp:84:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(l=0;l<g[i].val.size();++l) ^ user.cpp:44:31: warning: unused variable ‘n’ [-Wunused-variable] int k,nr=0,i,m=0,lung,x,j,n=0,l; ^ /tmp/ccFCilSG.o: In function `main': user.cpp:(.text.startup+0x62): warning: the `gets' function is dangerous and should not be used.