游戏大赛决赛两组选手得分已按从小到大排序，A组：[12, 35, 67, 89]，B组：[20, 45, 55, 78]，需合并为一个有序排行榜，现有归并合并核心代码如下：

A = [12, 35, 67, 89]
B = [20, 45, 55, 78]

i = 0
j = 0
result = []

while i < len(A) and j < len(B):
    ————————————————————————
    result.append(A[i])
    i += 1
else:
    result.append(B[j])
    j += 1

while i < len(A):
    result.append(A[i])
    i += 1

while j < len(B):
    result.append(B[j])
    j += 1

print("合并后的有序排行榜：", result)