34.Search for a Range LeetCode Java版代码
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Given a sorted array of integers, find the starting and ending position of a given target value.
Your algorithm's runtime complexity must be in the order of O(log n).
If the target is not found in the array, return [-1,-1].
For example,
Given [5,7,7,8,8,10] and target value 8,
return [3,4].
Tags : Binary Search, Array
题意解析:给定一个排序好的一维数组和一个要查找的目标值target,要求时间复杂度为O(log n).
根据时间复杂度要求,本题需要采用二分查找;
函数的结果是一个长度为2的数组ans, 当给定的数组中不存在target值得时候,返回[-1,-1];反之,返回target在给定数组中的初始下标和终止下标;
eg: 给定数组 [2,2,2,2,2] 要查找的数值为2
结果为[0,4]
下面是在leetcode上AC的代码:
public class Solution { public int[] searchRange(int[] nums, int target) { int len = nums.length;int[] ans = new int[2];Arrays.fill(ans, -1);if (len == 0)return ans;int min = 0;int max = len - 1;int mid = (min + max) / 2;while (min <= max) {if (target == nums[mid]) {ans[0] = mid;break;}if (target < nums[mid])max = mid - 1;elsemin = mid + 1;mid = (min + max) / 2;}if (min <= max) {int i = mid;int j = mid;while ((i - 1) >= 0 && nums[i-1] == target) {i--;}while ((j + 1) < len && nums[j+1] == target) {j++;}ans[0] = i;ans[1] = j;}return ans; }}
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