ivanmerlin的专栏

Given an array of integers, every element appears twice except for one. Find that single one.大意就是，别的数字都成双成对，只有一个数字孤身一人。【别名：寻找单身狗】Note:Your algorithm should have a linear runtime complexity

Given an array and a value, remove all instances of that value in place and return the new length.The order of elements can be changed. It doesn't matter what you leave beyond the new length.这

Reverse a singly linked list.单向链表是个难点。一开始用栈来做，结果报了内存超过了。后来想到用指针来做。保存第二个元素的下一个节点，让他们依次反序指向即可/** * Definition for singly-linked list. * public class ListNode { * int val; *

Related to question Excel Sheet Column TitleGiven a column title as appear in an Excel sheet, return its corresponding column number.For example: A -> 1 B -> 2 C -> 3 ...

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 array is non-empty and the majority element