Compilare: main.c: In function 'main': main.c:24:14: warning: array subscript has type 'char' [-Wchar-subscripts] 24 | ex[ a[ i ] ]++; | ~^~~~~ main.c:31:14: warning: array subscript has type 'char' [-Wchar-subscripts] 31 | nd[ b[ i ] ]++; | ~^~~~~ main.c:51:18: warning: array subscript has type 'char' [-Wchar-subscripts] 51 | if( nd[ a[ i ] ] > 0 ) | ~^~~~~ main.c:53:34: warning: array subscript has type 'char' [-Wchar-subscripts] 53 | while( j > 0 && ex[ b[ j - 1 ] ] && a[ i ] < b[ j - 1 ] ) | ~^~~~~~~~~ main.c:56:22: warning: array subscript has type 'char' [-Wchar-subscripts] 56 | ex[ b[ j ] ]--; | ~^~~~~ main.c:57:22: warning: array subscript has type 'char' [-Wchar-subscripts] 57 | nd[ b[ j ] ]++; | ~^~~~~ main.c:62:18: warning: array subscript has type 'char' [-Wchar-subscripts] 62 | nd[ a[ i ] ]--; | ~^~~~~ main.c:66:18: warning: array subscript has type 'char' [-Wchar-subscripts] 66 | ex[ a[ i ] ]--; | ~^~~~~