Compilare: main.cpp: In function 'void transformare()': main.cpp:59:29: warning: array subscript has type 'char' [-Wchar-subscripts] 59 | v[k] = frecv[s[i]] + '0'; | ~~~^ main.cpp: In function 'int main()': main.cpp:131:15: warning: array subscript has type 'char' [-Wchar-subscripts] 131 | frecv[ch] = (frecv[ch] + 1) % 2; | ^~ main.cpp:131:28: warning: array subscript has type 'char' [-Wchar-subscripts] 131 | frecv[ch] = (frecv[ch] + 1) % 2; | ^~ main.cpp: In function 'int factor()': main.cpp:93:12: warning: 'nr' may be used uninitialized in this function [-Wmaybe-uninitialized] 93 | return nr; | ^~