SillyVicky

摘要： Problem: 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, th 阅读全文

摘要： Problem: 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 c 阅读全文

摘要： Problem: Given a sorted linked list, delete all duplicates such that each element appears only once. For example,Given 1->1->2, return 1->2.Given 1->1 阅读全文

摘要： Problem: Write an algorithm to determine if a number is "happy". A happy number is a number defined by the following process: Starting with any positi 阅读全文

摘要： Problem: Given an integer, write a function to determine if it is a power of three. Could you do it without using any loop / recursion? Summary: 用非循环/ 阅读全文

摘要： Problem: Given an integer, write a function to determine if it is a power of two. Summary: 判断一个数n是不是2的整数幂。 Analysis: 这道题首先需要注意n为非整数是返回false的情况。 1. 若将n 阅读全文

摘要： Problem: You have a total of n coins that you want to form in a staircase shape, where every k-th row must have exactly k coins. Given n, find the tot 阅读全文

摘要： Problem： Given two non-negative numbers num1 and num2 represented as string, return the sum of num1 and num2. Summary: 以字符串的形式求两个整形数相加。 Analysis: 这道题是 阅读全文

摘要： Problem: Reverse a singly linked list. A linked list can be reversed either iteratively or recursively. Could you implement both? Summary: 翻转链表。 Analy 阅读全文

摘要： Problem: Given a roman numeral, convert it to an integer. Input is guaranteed to be within the range from 1 to 3999. Summary: 将罗马数字转换为十进制阿拉伯数字。 Analys 阅读全文