题目连接:http://leetcode.com/2010/09/print-all-combinations-of-number-as-sum.html 题目分析: 由于这里说明了输入是升序的,当然如果是乱序的输入,只要没有要求输出有序,就不需要排序,否则在计算时,先对数组进行排序处理. 假设当前的arr[i]比Sum小,则计入arr[i],并更新Sum的值.否则,跳过当前的arr[i]元素. 题目扩展和变形: 假设这里的数字是不能重复的,参见不重复求和. 参考代码: void Solve(c…

问题 该文章的最新版本已迁移至个人博客[比特飞],单击链接 https://www.byteflying.com/archives/3885 访问. 给定一个非负整数 c ,你要判断是否存在两个整数 a 和 b,使得 a2 + b2 = c. 输入: 5 输出: True 解释: 1 * 1 + 2 * 2 = 5 输入: 3 输出: False Given a non-negative integer c, your task is to decide whether there're two…

1 题目: Given a digit string, return all possible letter combinations that the number could represent. A mapping of digit to letters (just like on the telephone buttons) is given below. Input:Digit string "23" Output: ["ad", "ae&quo…

Given a string containing digits from 2-9inclusive, return all possible letter combinations that the number could represent. A mapping of digit to letters (just like on the telephone buttons) is given below. Note that 1 does not map to any letters. E…

Given a digit string, return all possible letter combinations that the number could represent. A mapping of digit to letters (just like on the telephone buttons) is given below. Input:Digit string "23" Output: ["ad", "ae", &q…

Letter Combinations of a Phone Number Given a digit string, return all possible letter combinations that the number could represent. A mapping of digit to letters (just like on the telephone buttons) is given below. Input:Digit string "23" Outpu…

Given a digit string, return all possible letter combinations that the number could represent. A mapping of digit to letters (just like on the telephone buttons) is given below. 解题思路: 思路一: 使用DFS算法,JAVA实现如下: static String[] alpha = new String[] { " &q…

题目描述: Given a digit string, return all possible letter combinations that the number could represent. A mapping of digit to letters (just like on the telephone buttons) is given below. Input:Digit string "23" Output: ["ad", "ae&quo…

Given a digit string, return all possible letter combinations that the number could represent. A mapping of digit to letters (just like on the telephone buttons) is given below. Input:Digit string "23" Output: ["ad", "ae", &q…

Given a string containing digits from 2-9 inclusive, return all possible letter combinations that the number could represent. A mapping of digit to letters (just like on the telephone buttons) is given below. Note that 1 does not map to any letters.…