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摘要： 改进版快排，pivot 不再是左边第一个元素，而是正中间元素（或者随机）。 有一个比较坑的地方就是，在每一趟双指针完成所有交换后，需要判断 pivot 需不需要被交换。 比如 test case 1 2 4 3，第一趟开始时 pivot 是 2， 先动右边的指针 j, 找到第一个比 2 小的数也就是 阅读全文

摘要： Description Given an array A of integers, return the number of (contiguous, non empty) subarrays that have a sum divisible by K. Example 1: Note: 1 思路 阅读全文

摘要： Description Given an array of integers and an integer k, you need to find the number of unique k diff pairs in the array. Here a k diff pair is define 阅读全文

摘要： Description Given a singly linked list, determine if it is a palindrome. Example 1: Example 2: Follow up: Could you do it in O(n) time and O(1) space? 阅读全文

摘要： Description Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive. The update(i, val) function modifies 阅读全文

摘要： Description Given an array of non negative integers, you are initially positioned at the first index of the array. Each element in the array represent 阅读全文

摘要： Description Given an array of non negative integers, you are initially positioned at the first index of the array. Each element in the array represent 阅读全文

摘要： Description Given an array of integers, find out whether there are two distinct indices i and j in the array such that the absolute difference between 阅读全文

摘要： Description Given an array of citations sorted in ascending order (each citation is a non-negative integer) of a researcher, write a function to compu 阅读全文

摘要： Description Given an array of citations (each citation is a non negative integer) of a researcher, write a function to compute the researcher's h inde 阅读全文