Compilare: user.c: In function ‘next’: user.c:16:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] while(v[aux[last-1]]>v[k] && v[k]<q) ^ user.c: In function ‘main’: user.c:105:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] fprintf(fo,"%c",v[aux[i]]); ^ user.c:27:21: warning: variable ‘c’ set but not used [-Wunused-but-set-variable] int cer,i,x,max,c,k,s,st,dr; ^ user.c:31:5: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d",&cer); ^ user.c:27:15: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] int cer,i,x,max,c,k,s,st,dr; ^