Accepted
/in/foo.cc: In function 'int main()': /in/foo.cc:34:19: warning: array subscript has type 'char' [-Wchar-subscripts] a[h.top().second]++; ^
/in/foo.cc: In function 'int main()': /in/foo.cc:34:19: warning: array subscript has type 'char' [-Wchar-subscripts] a[h.top().second]++; ^