Java算法leetcode 的相关内容

[Java·算法·中等] LeetCode15. 三数之和

题目给你一个整数数组 nums ，判断是否存在三元组 [nums[i], nums[j], nums[k]] 满足 i != j、i != k 且 j != k ，同时还满足 nums[i] + nums[j] + nums[k] == 0 。请你返回所有和为 0 且不重复的三元组...

[Java·算法·简单] LeetCode 27. 移除元素详细解读

题目给你一个数组 nums 和一个值 val，你需要原地移除所有数值等于 val 的元素，并返回移除后数组的新长度。不要使用额外的数组空间，你必须仅使用 O(1) 额外空间并原地修改输入数组。元素的顺序可以改变。你不需要考虑数组中超出新长度后面的元素。说明: 为什...

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[Java·算法·简单] LeetCode 14. 最长公共前缀详细解读

题目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 ""。示例示例1 输入：strs = ["flower","flow","flight"] 输出："fl" 示例2 输入：strs = ["dog","racecar","car"] 输出："" 解释：输入....

[Java·算法·简单] LeetCode 13. 罗马数字转整数详细解读

题目罗马数字包含以下七种字符: I， V， X， L，C，D 和 M。字符数值 I 1 V &nbs...

[Java·算法·简单] LeetCode 383. 赎金信详细解读

题目给你两个字符串：ransomNote 和 magazine ，判断 ransomNote 能不能由 magazine 里面的字符构成。如果可以，返回 true ；否则返回 false 。 magazine 中的每个字符只能在 ransomNote 中使用一次。示例示例1 输入：ranso...

[Java·算法·简单] LeetCode 392. 判断子序列详细解读

题目给定字符串 s 和 t ，判断 s 是否为 t 的子序列。字符串的一个子序列是原始字符串删除一些（也可以不删除）字符而不改变剩余字符相对位置形成的新字符串。（例如，"ace"是"abcde"的一个子序列，而"aec"不是）。进阶：如果有大量输入的 S，称作 S1, S2, ... , S...

[Java·算法·简单] LeetCode 125. 验证回文串详细解读

题目描述如果在将所有大写字符转换为小写字符、并移除所有非字母数字字符之后，短语正着读和反着读都一样。则可以认为该短语是一个回文串。字母和数字都属于字母数字字符。给你一个字符串 s，如果它是回文串，返回 true ；否则，返回 false 。示例示例1 ...

[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...

[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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