十三周 Dynamic programming counting bits
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Problem
Given a sorted array of n integers, find the starting and ending position of a given target value.
If the target is not found in the array, return [-1, -1]
.
Example
Given [5, 7, 7, 8, 8, 10]
and target value 8
,
return [3, 4]
.
首先,建立二元结果数组res,起点start,终点end。
二分法求左边界:
当中点小于target,start移向中点,否则end移向中点;
先判断起点,再判断终点是否等于target,如果是,赋值给res[0]。
二分法求右边界:
当中点大于target,end移向中点,否则start移向中点;
先判断终点,再判断起点是否等于target,如果是,赋值给res[1]
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