摘要: 相同概率获取元素O(n) public static void main(String[] args) { //随机获取元素为3的下标 int target = 3; Random random = new Random(); int[] arr = {1, 2, 3, 3, 3, 4, 5}; i 阅读全文
posted @ 2022-04-25 13:54 java架构师1 阅读(54) 评论(0) 推荐(0)
摘要: leetcode每日一题 398. 随机数索引 class Solution {​ private int[] nums;​ public Solution(int[] nums) { this.nums = nums; } public int pick(int target) { List<In 阅读全文
posted @ 2022-04-25 11:03 java架构师1 阅读(28) 评论(0) 推荐(0)
摘要: find_in_set 查询 随便弄了个表,演示查询效果 阅读全文
posted @ 2022-04-25 09:43 java架构师1 阅读(42) 评论(0) 推荐(0)