[CareerCup] 11.5 Search Array with Empty Strings 搜索含有空字符串的数组 - Grandyang - 博客园



[CareerCup] 11.5 Search Array with Empty Strings 搜索含有空字符串的数组 - Grandyang - 博客园

[CareerCup] 11.5 Search Array with Empty Strings 搜索含有空字符串的数组

 

11.5 Given a sorted array of strings which is interspersed with empty strings, write a method to find the location of a given string.
 EXAMPLE
 Input: find "ball" in {"at", "", "", "", "ball", "", "", "car", "", "", "dad", "", ""}
 Output: 4

 

这道题给了我们一个有序的字符串数组,但是在中间加入了很多空字符串,让我们来查找一个给定字符串。如果没有这些空字符串,那么我们用二分查找法很容易搜索,但是这些空字符串就有很大的干扰作用。那么我们要在原有的二分查找法上做修改,类似的修改二分查找法的里有Search in Rotated Sorted Array 在旋转有序数组中搜索Search in Rotated Sorted Array II 在旋转有序数组中搜索之二。这道题我们的思路是,查找中间的字符串,如果是空字符串,那么我们用二分查找法来找周围最近的非空字符串,然后把mid移到飞空字符串的位置,继续二分查找。相当于二分查找中又嵌套了一个二分查找,参见代码如下:


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