摘要： problem: first: result: second try: result: 换成StringBuffer，效果竟然一样？？ 3nd: result: 可见，用数组代替string和StringBuffer或StringBuilder会更快。 4th: result: conclusion 阅读全文

摘要： problem: first: result: Submission Result: Wrong Answer Input: "RLUURDDDLU" Output: false 2: result: 参考答案： result： retry: result: conclusion: 可见把Strin 阅读全文

摘要： problem: Given an array of integers that is already sorted in ascending order, find two numbers such that they add up to a specific target number. The 阅读全文

摘要： 问题： 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 阅读全文

摘要： 问题： Given an array of integers where 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice and others appear once. Find all the elements of [1, 阅读全文

摘要： question: question: Given an array containing n distinct numbers taken from 0, 1, 2, ..., n, find the one that is missing from the array. Example 1 Ex 阅读全文

摘要： 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

摘要： Given a non-empty array of non-negative integers nums, the degree of this array is defined as the maximum frequency of any one of its elements. Your t 阅读全文

摘要： 问题： We have two special characters. The first character can be represented by one bit 0. The second character can be represented by two bits (10 or 11 阅读全文

摘要： 问题： 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, 阅读全文