Compilare: main.cpp: In function 'int main()': main.cpp:12:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<=strlen(s)-2 && ok==0;i++) ~^~~~~~~~~~~~~ main.cpp:13:18: warning: array subscript has type 'char' [-Wchar-subscripts] if(v[s[i]][s[i+1]]!=0) ^ main.cpp:13:26: warning: array subscript has type 'char' [-Wchar-subscripts] if(v[s[i]][s[i+1]]!=0) ^ main.cpp:16:19: warning: array subscript has type 'char' [-Wchar-subscripts] v[s[i]][s[i+1]]=v[s[i]][s[i+1]]+1; ^ main.cpp:16:27: warning: array subscript has type 'char' [-Wchar-subscripts] v[s[i]][s[i+1]]=v[s[i]][s[i+1]]+1; ^ main.cpp:16:35: warning: array subscript has type 'char' [-Wchar-subscripts] v[s[i]][s[i+1]]=v[s[i]][s[i+1]]+1; ^ main.cpp:16:43: warning: array subscript has type 'char' [-Wchar-subscripts] v[s[i]][s[i+1]]=v[s[i]][s[i+1]]+1; ^