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[Java·算法·简单] LeetCode 9. 回文数详细解读

题目给你一个整数 x ，如果 x 是一个回文整数，返回 true ；否则，返回 false 。回文数是指正序（从左向右）和倒序（从右向左）读都是一样的整数。例如，121 是回文，而 123 不是。示例示例1 输入：x = 121 输出：true 示例2 输入：x...

[Java·算法·中等] LeetCode274. H指数详细解读

题目在一条环路上有 n 个加油站，其中第 i 个加油站有汽油 gas[i] 升。你有一辆油箱容量无限的的汽车，从第 i 个加油站开往第 i+1 个加油站需要消耗汽油 cost[i] 升。你从其中的一个加油站出发，开始时油箱为空。给定两个整数...

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[Java·算法·中等] LeetCode274. H指数详细解读

题目给你一个整数数组 citations ，其中 citations[i] 表示研究者的第 i 篇论文被引用的次数。计算并返回该研究者的 h 指数。根据维基百科上 h 指数的定义：h 代表“高引用次数” ，一名科研人员的 h 指数是指他（她）至少发表了 h 篇论文，并且每篇论文至少被...

[Java·算法·中等] LeetCode122. 买股票的最佳时机 II 解读

题目给你一个整数数组 prices ，其中 prices[i] 表示某支股票第 i 天的价格。在每一天，你可以决定是否购买和/或出售股票。你在任何时候最多只能持有一股股票。你也可以先购买，然后在同一天出售。返回你能获得的最大利润。示例示例1输入：prices = [7,1,5,3...

[Java·算法·简单] LeetCode 9. 回文数详细解读

题目给你一个整数x，如果 x 是一个回文整数，返回true；否则，返回 false 。回文数是指正序（从左向右）和倒序（从右向左）读都是一样的整数。例如，121是回文，而 123 不是。示例示例1输入：x = 121输出：true示例2输入：x = -121输出：false解释：从左向右读, 为 -...

[Java·算法·中等] LeetCode 45. 跳跃游戏 II 详细解读

题目给定一个长度为 n 的 0 索引整数数组 nums。初始位置为 nums[0]。每个元素nums[i]表示从索引 i 向前跳转的最大长度。换句话说，如果你在 nums[i] 处，你可以跳转到任意 nums[i + j] 处:0 <= j <= nums[i] i + j < n...

[Java·算法·简单] LeetCode121. 买股票的最佳时机详细解读

题目给定一个数组 prices ，它的第 i 个元素 prices[i] 表示一支给定股票第 i 天的价格。你只能选择某一天买入这只股票，并选择在未来的某一个不同的日子卖出该股票。设计一个算法来计算你所能获取的最大利润。返回你可以从这笔交易中获取的最大利润。如果你不能获取任何利润，返回 0 ...

Java算法-LeetCode14最长公共前缀

题目地址：https://leetcode-cn.com/problems/longest-common-prefix/编写一个函数来查找字符串数组中的最长公共前缀。如果不存在公共前缀，返回空字符串 ""。示例 1: 输入: ["flower","flow","flight"] 输出: &amp...

Java算法-LeetCode1两数之和

题目地址：https://leetcode-cn.com/problems/two-sum/ 给定一个整数数组 nums 和一个目标值 target，请你在该数组中找出和为目标值的那两个整数，并返回他们的数组下标。你可以假设每种输入只会对应一个答案。但是，你不能重复利用这个数组中同样的元素。 ...

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