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:29:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[id(a[i])] -= 1; ^ user.cpp:32:21: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (f[id(c1)] < f[id(c2)]) { ^ user.cpp:32:33: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (f[id(c1)] < f[id(c2)]) { ^ user.cpp:36:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (f[id(ch)] > f[id(c1)]) { ^ user.cpp:36:37: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (f[id(ch)] > f[id(c1)]) { ^ user.cpp:39:32: warning: array subscript has type ‘char’ [-Wchar-subscripts] } else if (f[id(ch)] > f[id(c2)]) { ^ user.cpp:39:44: warning: array subscript has type ‘char’ [-Wchar-subscripts] } else if (f[id(ch)] > f[id(c2)]) { ^ user.cpp:46:40: 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:48:29: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (f[id(c1)] <= left && f[id(c2)] <= left) { ^ user.cpp:48:50: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (f[id(c1)] <= left && f[id(c2)] <= left) { ^ user.cpp:52:25: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[id(ch)] += 1; ^ user.cpp:58:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] f[id(b[i])] -= 1; ^ user.cpp:59:20: warning: array subscript has type ‘char’ [-Wchar-subscripts] fB[id(b[i])] -= 1; ^