Compilare: main.cpp: In function 'int main()': main.cpp:19:20: warning: array subscript has type 'char' [-Wchar-subscripts] 19 | fr[s2[x]]++; | ~~~~^ main.cpp:28:24: warning: array subscript has type 'char' [-Wchar-subscripts] 28 | if (fr[s1[x]]>0) | ~~~~^ main.cpp:31:24: warning: array subscript has type 'char' [-Wchar-subscripts] 31 | fr[s1[x]]--; | ~~~~^ main.cpp:50:20: warning: array subscript has type 'char' [-Wchar-subscripts] 50 | fr[s2[x]]++; | ~~~~^ main.cpp:59:24: warning: array subscript has type 'char' [-Wchar-subscripts] 59 | if (fr[s1[x]]>0) | ~~~~^ main.cpp:62:24: warning: array subscript has type 'char' [-Wchar-subscripts] 62 | fr[s1[x]]--; | ~~~~^ main.cpp:81:21: warning: array subscript has type 'char' [-Wchar-subscripts] 81 | fr2[s1[x]]++; | ~~~~^ main.cpp:93:25: warning: array subscript has type 'char' [-Wchar-subscripts] 93 | if (fr[s1[y]]!=0) | ~~~~^ main.cpp:95:65: warning: array subscript has type 'char' [-Wchar-subscripts] 95 | while (s.size ()>0 && s.top()>s1[y] && fr2[s.top()]>=fr[s.top()]+1) | ~~~~~^~ main.cpp:95:78: warning: array subscript has type 'char' [-Wchar-subscripts] 95 | while (s.size ()>0 && s.top()>s1[y] && fr2[s.top()]>=fr[s.top()]+1) | ~~~~~^~ main.cpp:97:30: warning: array subscript has type 'char' [-Wchar-subscripts] 97 | fr[s.top()]--; | ~~~~~^~ main.cpp:101:25: warning: array subscript has type 'char' [-Wchar-subscripts] 101 | fr[s1[y]]++;fr2[s1[y]]--; | ~~~~^ main.cpp:101:38: warning: array subscript has type 'char' [-Wchar-subscripts] 101 | fr[s1[y]]++;fr2[s1[y]]--; | ~~~~^