Compilare: user.cpp: In function ‘void pd(short int)’: user.cpp:16:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<a[x].size();i++) ^ user.cpp:21:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<a[x].size();j++) ^ user.cpp:15:17: warning: unused variable ‘s’ [-Wunused-variable] short i,y,j,s=0,it; ^ user.cpp:15:21: warning: unused variable ‘it’ [-Wunused-variable] short i,y,j,s=0,it; ^