LeetCode contest 187 1437. 是否所有 1 都至少相隔 k 个元素 Check If All 1's Are at Least Length K Places Away
Table of Contents
一、中文版
给你一个由若干 0
和 1
组成的数组nums
以及整数 k
。如果所有 1
都至少相隔 k
个元素,则返回 True
;否则,返回 False
。
示例 1:
输入:nums = [1,0,0,0,1,0,0,1], k = 2 输出:true 解释:每个 1 都至少相隔 2 个元素。
示例 2:
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输入:nums = [1,0,0,1,0,1], k = 2 输出:false 解释:第二个 1 和第三个 1 之间只隔了 1 个元素。
示例 3:
输入:nums = [1,1,1,1,1], k = 0 输出:true
示例 4:
输入:nums = [0,1,0,1], k = 1 输出:true
提示:
1 <= nums.length <= 10^5
0 <= k <= nums.length
nums[i] 的值为 0 或 1
二、英文版
Given an array nums of 0s and 1s and an integer k, return True if all 1's are at least k places away from each other, otherwise return False.
Example 1:
Input: nums = [1,0,0,0,1,0,0,1], k = 2 Output: true Explanation: Each of the 1s are at least 2 places away from each other.
Example 2:
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Input: nums = [1,0,0,1,0,1], k = 2 Output: false Explanation: The second 1 and third 1 are only one apart from each other.
Example 3:
Input: nums = [1,1,1,1,1], k = 0 Output: true
Example 4:
Input: nums = [0,1,0,1], k = 1 Output: true
Constraints:
1 <= nums.length <= 10^5
0 <= k <= nums.length
nums[i] is 0 or 1
三、My answer
class Solution: def kLengthApart(self, nums: List[int], k: int) -> bool: index_list = [] for i in range(len(nums)): if nums[i] == 1: index_list.append(i) for i in range(1,len(index_list)): subtract = index_list[i] - index_list[i-1] if subtract - 1 < k: return False return True
四、解题报告
用一个 index_list 来保存所有 1 出现的位置。
遍历 index_list,后项减前项做差,判断差值与 k 的关系即可。