Compilare: user.cpp: In function ‘int main()’: user.cpp:25:24: warning: array subscript has type ‘char’ [-Wchar-subscripts] b[i] = b[ch_p[s[i][0]]] + 1; ^ user.cpp:28:22: warning: array subscript has type ‘char’ [-Wchar-subscripts] c[i] = ch_p[s[i][0]]; ^ user.cpp:29:37: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (b[ch_p[s[i][s[i].length() - 1]]] < b[i]) ^ user.cpp:30:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] ch_p[s[i][s[i].length() - 1]] = i; ^