leetcode-34. Search for a Range
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https://leetcode.com/problems/search-for-a-range/#/description
问题描述:
一个升序排列的数组,又重复值的那种,制定一个target,找到包含这个target的起始和终止位置,还是使用这般查找,分区间。
代码如下:
public class Solution { public int[] searchRange(int[] nums, int target) { int[] result=new int[2]; result[0]=findFirst(nums,target); result[1]=findLast(nums,target); return result; } private int findFirst(int[] nums, int target) { int index=-1; int lo=0; int hi=nums.length-1; while(lo<=hi) { int mid=(lo+hi)/2; if(target<=nums[mid]) { hi=mid-1; }else { lo=mid+1; } if(nums[mid]==target) index=mid; } return index; } private int findLast(int[] nums, int target) { int index=-1; int lo=0; int hi=nums.length-1; while(lo<=hi) { int mid=(lo+hi)/2; if(target>=nums[mid]) { lo=mid+1; }else { hi=mid-1; } if(nums[mid]==target) index=mid; } return index; }}
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