Compilare: user.cpp: In function ‘std::__cxx11::string solve(const string&)’: user.cpp:23:17: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[id(ch)] += 2; ^ user.cpp:24:18: warning: array subscript has type ‘char’ [-Wchar-subscripts] fB[id(ch)] += 1; ^ user.cpp:28:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[id(a[i])] -= 1; ^ user.cpp:31:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (f[id(c1)] < f[id(c2)]) { ^ user.cpp:31:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (f[id(c1)] < f[id(c2)]) { ^ user.cpp:35:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (f[id(ch)] > f[id(c1)]) { ^ user.cpp:35:37: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (f[id(ch)] > f[id(c1)]) { ^ user.cpp:38:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] } else if (f[id(ch)] > f[id(c2)]) { ^ user.cpp:38:44: warning: array subscript has type ‘char’ [-Wchar-subscripts] } else if (f[id(ch)] > f[id(c2)]) { ^ user.cpp:45:40: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (ch != a[i] && fB[id(ch)] > 0) { ^ user.cpp:47:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[id(ch)] -= 1; ^ user.cpp:55:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (f[id(c1)] > left / 2 || f[id(c2)] > left / 2) { ^ user.cpp:55:53: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (f[id(c1)] > left / 2 || f[id(c2)] > left / 2) { ^ user.cpp:62:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[id(ch)] += 1; ^ user.cpp:68:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[id(b[i])] -= 1; ^ user.cpp:69:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] fB[id(b[i])] -= 1; ^ user.cpp: In function ‘int main()’: