Compilare: main.cpp: In function 'void transformare()': main.cpp:145:29: warning: array subscript has type 'char' [-Wchar-subscripts] 145 | v[k] = frecv[s[i]] + '0'; | ~~~^ main.cpp: In function 'int main()': main.cpp:165:15: warning: array subscript has type 'char' [-Wchar-subscripts] 165 | frecv[ch] = (frecv[ch] + 1) % 2; | ^~ main.cpp:165:28: warning: array subscript has type 'char' [-Wchar-subscripts] 165 | frecv[ch] = (frecv[ch] + 1) % 2; | ^~ main.cpp: In function 'int factor()': main.cpp:44:12: warning: 'nr' may be used uninitialized in this function [-Wmaybe-uninitialized] 44 | return nr; | ^~