已知a数组元素共5个,依次为12,10,5,3,1;b数组元素共4个,依次为4,6,8,15,则执行如下所示的过程语句sort后得到c数组各元素依次为15,12,10,8,6,5,4,3,1;数组a,b,c的长度分别为l=5,m=4,n=9请在方框内填入正确的成分,完成上述要求。 PROCEDURE sort; VAR i, j, k, x: integer; d: ARRAY[1..m] OF integer; BEGIN FOR i:=1 TO m DO d[i]:= (1) ; i:=1; j:=1; k:=1; WHILE (i<=l) AND (j<=m) DO BEGIN IF a[i]>d[j] THEN BEGIN (2) ; (3) _END ELSE BEGIN (4) __; (5) __END; c[k]:=x; (6) END; WHILE (7) _DO BEGIN c[k]:=a[i]; k:=k+1; i:=i+1;END; WHILE (8) _DO BEGIN c[k]:=d[j]; k:=k+1; j:=j+1;END; END. {sort}