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★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★ Given a sorted array and a target value, return the index if the target is found. If not, return the index where it would be if it were inserted in order. You may assume no duplicates in the array. Example 1: Input: [1,3,5,6], 5 Output: 2 Example 2: Input: [1,3,5,6], 2 Output: 1 Example 3: Input: [1,3,5,6], 7 Output: 4 Example 4: Input: [1,3,5,6], 0 Output: 0 给定一个排序数组和一个目标值,在数组中找到目标值,并返回其索引。如果目标值不存在于数组中,返回它将会被按顺序插入的位置。 你可以假设数组中无重复元素。 示例 1: 输入: [1,3,5,6], 5 输出: 2 示例 2: 输入: [1,3,5,6], 2 输出: 1 示例 3: 输入: [1,3,5,6], 7 输出: 4 示例 4: 输入: [1,3,5,6], 0 输出: 0 1 class Solution { 2 func searchInsert(_ nums: [Int], _ target: Int) -> Int { 3 //如果nums为nil则返回0 4 if nums.isEmpty{return 0} 5 //二分查找也称折半查找(Binary Search) 6 var low:Int = 0 7 var high:Int = nums.count-1 8 while(low <= high) 9 { 10 var mid = (low+high)/2 11 if nums[mid]==target 12 { 13 return mid 14 } 15 else if nums[mid]<target 16 { 17 low = mid+1 18 } 19 else 20 { 21 high = mid-1 22 } 23 } 24 return low 25 } 26 } |
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