[LeetCode] 955. Delete Columns to Make Sorted II 删除列使其有序之二
WearegivenanarrayAofNlowercaseletterstrings,allofthesamelength.Now,wemaychooseanysetofdeletionindices,andforeachstring,wedeleteallthecharactersinthoseindices.Forexample,ifwehaveanarrayA=["abcdef","uvw