随笔分类 - LeetCode
摘要：Description 实现 strStr() 函数。 给你两个字符串 haystack 和 needle ，请你在 haystack 字符串中找出 needle 字符串出现的第一个位置（下标从 0 开始）。如果不存在，则返回 -1 。 说明： 当 needle 是空字符串时，我们应当返回什么值呢？
阅读全文
摘要：Description 给你两个有序整数数组nums1和nums2，请你将nums2合并到nums1中，使nums1成为一个有序数组。 说明: 初始化nums1和nums2的元素数量分别为m和n。 你可以假设nums1有足够的空间（空间大小大于或等于 m + n）来保存nums2中的元素。 示例:
阅读全文
摘要：Description Given the array nums, for each nums[i] find out how many numbers in the array are smaller than it. That is, for each nums[i] you have to c
阅读全文
摘要：Description Given an array, rotate the array to the right by k steps, where k is non-negative. Follow up: Try to come up as many solutions as you can,
阅读全文
摘要：Description Given an array , write a function to move all s to the end of it while maintaining the relative order of the non zero elements. Example: N
阅读全文
摘要：Description Alice and Bob take turns playing a game, with Alice starting first. Initially, there is a number on the chalkboard. On each player's turn,
阅读全文
摘要：Description Given a $m \times n$ grid filled with non negative numbers, find a path from top left to bottom right which minimizes the sum of all numbe
阅读全文
摘要：Description A robot is located at the top left corner of a m x n grid (marked 'Start' in the diagram below). The robot can only move either down or ri
阅读全文
摘要：Description Given a binary matrix , we want to flip the image horizontally, then invert it, and return the resulting image. To flip an image horizonta
阅读全文
摘要：Description Write a function to delete a node (except the tail) in a singly linked list, given only access to that node. Given linked list head = [4,5
阅读全文
摘要：Description Given an array of integers , write a method that returns the "pivot" index of this array. We define the pivot index as the index where the
阅读全文
摘要：Given a function which generates a uniform random integer in the range 1 to 7, write a function which generates a uniform random integer in the range
阅读全文
摘要：Description e Tribonacci sequence Tn is defined as follows: T0 = 0, T1 = 1, T2 = 1, and Tn+3 = Tn + Tn+1 + Tn+2 for n = 0. Given , return the value of
阅读全文
摘要：Description Given a sorted (in ascending order) integer array of elements and a value, write a function to search in . If exists, then return its inde
阅读全文
摘要：Description You are given a license key represented as a string S which consists only alphanumeric character and dashes. The string is separated into
阅读全文
摘要：Description Given a valid (IPv4) IP , return a defanged version of that IP address. A defanged IP address replaces every period with . Example 1: Exam
阅读全文
摘要：Description Implement function ToLowerCase() that has a string parameter str, and returns the same string in lowercase. Example 1: Example 2: Example
阅读全文
摘要：Description Given an array of size $n$, find the majority element. The majority element is the element that appears more than times. You may assume th
阅读全文
摘要：Description Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to th
阅读全文
摘要：Description Design a stack that supports push, pop, top, and retrieving the minimum element in constant time. push(x) Push element x onto stack. pop()
阅读全文