Compilare: main.cpp: In function 'int main()': main.cpp:30:29: warning: array subscript has type 'char' [-Wchar-subscripts] if(ap[char(c[j])]==0) ^ main.cpp:33:24: warning: array subscript has type 'char' [-Wchar-subscripts] ap[c[j]]=1; ^ main.cpp: In function 'void clearap()': main.cpp:13:14: warning: iteration 255 invokes undefined behavior [-Waggressive-loop-optimizations] ap[i]=0; ~~~~~^~ main.cpp:12:14: note: within this loop for(i=1;i<=256;i++) ~^~~~~