Compilare: user.cpp: In function ‘void A(int, char, char, char)’: user.cpp:21:9: warning: array subscript has type ‘char’ [-Wchar-subscripts] sol[c1].pb(i); ^ user.cpp:22:9: warning: array subscript has type ‘char’ [-Wchar-subscripts] sol[c2].pb(i + 1); ^ user.cpp:23:9: warning: array subscript has type ‘char’ [-Wchar-subscripts] sol[c3].pb(i + 2); ^ user.cpp:24:9: warning: array subscript has type ‘char’ [-Wchar-subscripts] sol[c1].pb(i + 3); ^ user.cpp: In function ‘void B(int, char, char, char)’: user.cpp:29:9: warning: array subscript has type ‘char’ [-Wchar-subscripts] sol[c1].pb(i); ^ user.cpp:30:9: warning: array subscript has type ‘char’ [-Wchar-subscripts] sol[c2].pb(i + 1); ^ user.cpp:31:9: warning: array subscript has type ‘char’ [-Wchar-subscripts] sol[c3].pb(i + 2); ^ user.cpp:32:9: warning: array subscript has type ‘char’ [-Wchar-subscripts] sol[c1].pb(i + 3); ^ user.cpp:33:9: warning: array subscript has type ‘char’ [-Wchar-subscripts] sol[c2].pb(i + 4); ^ user.cpp: In function ‘void C(int, char, char, char)’: user.cpp:38:9: warning: array subscript has type ‘char’ [-Wchar-subscripts] sol[c1].pb(i); ^ user.cpp:39:9: warning: array subscript has type ‘char’ [-Wchar-subscripts] sol[c2].pb(i + 1); ^ user.cpp:40:9: warning: array subscript has type ‘char’ [-Wchar-subscripts] sol[c3].pb(i + 2); ^