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Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists.Subscribe... 阅读全文
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Write an algorithm to determine if a number is "happy".A happy number is a number defined by the following process: Starting with any positive integer... 阅读全文
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You are climbing a stair case. It takes n steps to reach to the top.Each time you can either climb 1 or 2 steps. In how many distinct ways can you cli... 阅读全文
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Given a sorted linked list, delete all duplicates such that each element appear only once.For example, Given 1->1->2, return 1->2. Given 1->1->2->3->3... 阅读全文
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Reverse a singly linked list对于这种可以修改值的，把值逆序就可以了。。。。用vector存，然后逆序读。都忘了指针怎么赋值初始化了。*p=&head; 1 /** 2 * Definition for singly-linked list. 3 * struct Li... 阅读全文
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Given a roman numeral, convert it to an integer.Input is guaranteed to be within the range from 1 to 3999.题目虽短，但是难度还是在那里的。首先，我们需要明白罗马数字是怎么计数的，当你明白了这个就... 阅读全文
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Given an array of size n, find the majority element. The majority element is the element that appears more than ⌊ n/2 ⌋ times.You may assume that the ... 阅读全文
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---恢复内容开始---【一】一共有n个人，有m条跳绳，我们如何分配组以及组员数，使得每组的人数相差最少，例如输入9个人，8条跳绳，最佳分配是5,4；刚开始并没有理解题的意思，情急之下，百度为上。看到一道和这道题非常类似的题目。输入两个数，人数为n，跳绳数为m。首先，加入人数小于m分成1组就好了，如... 阅读全文
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Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as the Hamming weight).For example, the 32-bit i... 阅读全文
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Given an array of integers, find if the array contains any duplicates. Your function should return true if any value appears at least twice in the arr... 阅读全文
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Given two strings s and t, write a function to determine if t is an anagram of s.For example,s = "anagram", t = "nagaram", return true.s = "rat", t = ... 阅读全文
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Given an array nums, write a function to move all 0's to the end of it while maintaining the relative order of the non-zero elements.For example, give... 阅读全文
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Given two binary trees, write a function to check if they are equal or not.Two binary trees are considered equal if they are structurally identical an... 阅读全文
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Given an integer array nums, find the sum of the elements between indices i and j (i ≤ j), inclusive.Example:Given nums = [-2, 0, 3, -5, 2, -1]sumRang... 阅读全文
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Invert a binary tree. 4 / \ 2 7 / \ / \1 3 6 9to 4 / \ 7 2 / \ / \9 6 3 1比较简单，二叉树里的题其实有点举一反三的意思，很多题会一道就差不多了。递归的反... 阅读全文