Compilare: main.cpp: In function 'int main()': main.cpp:19:23: warning: array subscript has type 'char' [-Wchar-subscripts] if(fr[s[j]]==0) ^ main.cpp:21:20: warning: array subscript has type 'char' [-Wchar-subscripts] fr[s[j]]++; ^ main.cpp:32:23: warning: array subscript has type 'char' [-Wchar-subscripts] if(fr[s[i]]==1) ^ main.cpp:34:21: warning: array subscript has type 'char' [-Wchar-subscripts] fr[s[i]]--; ^ main.cpp:10:50: warning: unused variable 'n' [-Wunused-variable] long long int i=0,j=0,nr=0,li,lf,maxi=-1,c,z,n; ^ main.cpp:10:35: warning: 'lf' may be used uninitialized in this function [-Wmaybe-uninitialized] long long int i=0,j=0,nr=0,li,lf,maxi=-1,c,z,n; ^~