Compilare: user.cpp: In function ‘int main()’: user.cpp:10:17: warning: suggest parentheses around ‘+’ inside ‘>>’ [-Wparentheses] fin>>n>>k>>s+1; ^ user.cpp:13:15: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[s[i]]++; ^ user.cpp:14:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(f[s[i]]==1) ^ user.cpp:17:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[s[p]]--; ^ user.cpp:18:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] if(f[s[p]]==0) ^