Compilare: user.cpp: In function ‘int sol()’: user.cpp:9:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(fr[a]==x||fr[c]==x||fr[b]==x) return x; ^ user.cpp:9:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(fr[a]==x||fr[c]==x||fr[b]==x) return x; ^ user.cpp:9:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(fr[a]==x||fr[c]==x||fr[b]==x) return x; ^ user.cpp:10:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] if((fr[a]&fr[b]&fr[c]&1)||(!((fr[a]|fr[b]|fr[c])&1))) return 2; ^ user.cpp:10:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] if((fr[a]&fr[b]&fr[c]&1)||(!((fr[a]|fr[b]|fr[c])&1))) return 2; ^ user.cpp:10:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] if((fr[a]&fr[b]&fr[c]&1)||(!((fr[a]|fr[b]|fr[c])&1))) return 2; ^ user.cpp:10:39: warning: array subscript has type ‘char’ [-Wchar-subscripts] if((fr[a]&fr[b]&fr[c]&1)||(!((fr[a]|fr[b]|fr[c])&1))) return 2; ^ user.cpp:10:45: warning: array subscript has type ‘char’ [-Wchar-subscripts] if((fr[a]&fr[b]&fr[c]&1)||(!((fr[a]|fr[b]|fr[c])&1))) return 2; ^ user.cpp:10:51: warning: array subscript has type ‘char’ [-Wchar-subscripts] if((fr[a]&fr[b]&fr[c]&1)||(!((fr[a]|fr[b]|fr[c])&1))) return 2; ^ user.cpp: In function ‘int main()’: user.cpp:19:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] for(i=0;i<x;++i) fr[s[i]]++; ^ user.cpp:21:13: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[a]=fr[b]=fr[c]=0; ^ user.cpp:21:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[a]=fr[b]=fr[c]=0; ^ user.cpp:21:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] fr[a]=fr[b]=fr[c]=0; ^