摘要：
package _interview_question /** * Check if a given array contains duplicate elements within k distance from each other. * Given an unsorted array that 阅读全文
摘要：
package LeetCode_279 import java.util.* import kotlin.collections.HashSet /** * 279. Perfect Squares * https://leetcode.com/problems/perfect-squares/d 阅读全文
摘要：
package _interview_question import java.util.* /** * The question is to find the fewest number of operations needed to get to 1. available operations: 阅读全文