难度: Easy
原题连接
- https://leetcode.com/problems/search-insert-position
- https://leetcode-cn.com/problems/search-insert-position
内容描述
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
思路 1: 暴力
class Solution(object):
def searchInsert(self, nums, target):
"""
:type nums: List[int]
:type target: int
:rtype: int
"""
i = 0
while nums[i] < target:
i += 1
if i == len(nums):
return i
return i
思路 2: 二分
class Solution(object):
def searchInsert(self, nums, target):
"""
:type nums: List[int]
:type target: int
:rtype: int
"""
left = 0
right = len(nums) - 1
while left <= right:
mid = (left + right) // 2
print(">>> %s: %s[%s], %s[%s], %s[%s]" % (target, nums[left], left, nums[right], right, nums[mid], mid))
if nums[mid] > target:
right = mid - 1
elif nums[mid] < target:
left = mid + 1
else:
break
mid = mid+1 if left > mid else mid
print("结果: ", mid, left)
return mid