Compilare: main.cpp: In function 'int main()': main.cpp:29:20: warning: array subscript has type 'char' [-Wchar-subscripts] f[c]++,ss=ss+c; ^ main.cpp:37:20: warning: array subscript has type 'char' [-Wchar-subscripts] for(i=0;f[c]&&i<s.size();f[c]--) ^ main.cpp:37:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;f[c]&&i<s.size();f[c]--) ~^~~~~~~~~ main.cpp:37:37: warning: array subscript has type 'char' [-Wchar-subscripts] for(i=0;f[c]&&i<s.size();f[c]--) ^ main.cpp:41:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(nr=0;!nr&&i<s.size();i++) ~^~~~~~~~~ main.cpp:55:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<s.size()) ~^~~~~~~~~ main.cpp:61:20: warning: array subscript has type 'char' [-Wchar-subscripts] f[c]++; ^ main.cpp:65:15: warning: array subscript has type 'char' [-Wchar-subscripts] if(f[c]) ^ main.cpp:67:22: warning: array subscript has type 'char' [-Wchar-subscripts] while(f[c]) ^ main.cpp:73:20: warning: array subscript has type 'char' [-Wchar-subscripts] f[c]--; ^ main.cpp:13:11: warning: unused variable 'j' [-Wunused-variable] int i,j,k,nr; ^ main.cpp:13:13: warning: unused variable 'k' [-Wunused-variable] int i,j,k,nr; ^