Compilare: user.cpp: In function ‘int fill(int, int, char)’: user.cpp:28:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:32:35: warning: unused variable ‘d’ [-Wunused-variable] int i,j, cate1=0,cate2=0,cate3=0,d; ^ user.cpp:68:6: warning: unused variable ‘l’ [-Wunused-variable] int l=0; ^