天行健，君子以自强不息

Your are given an array of positive integers nums.Count and print the number of (contiguous) subarrays where the product of all the elements in the subarray is less than k.Example 1:Input: nums ...

Given a string S and a string T, find the minimum window in S which will contain all the characters in T in complexity O(n).Example:Input: S = "ADOBECODEBANC", T = "ABC"Output: "BANC"Note:I...

给定一个字符串 s ，找出至多包含两个不同字符的最长子串 t 。示例 1:输入: "eceba"输出: 3解释: t 是 "ece"，长度为3。示例 2:输入: "ccaabbb"输出: 5解释: t 是 "aabbb"，长度为5。来源：力扣（LeetCode）链接：https://leetcode-cn.com/problems/longest-substrin...

In a row of trees, the i-th tree produces fruit with type tree[i].You start at any tree of your choice, then repeatedly perform the following steps:Add one piece of fruit from this tree to your b...

Given an array nums, there is a sliding window of size k which is moving from the very left of the array to the very right. You can only see the k numbers in the window. Each time the sliding window ...