把电话号码转换成为词典中能够记忆的的单词的组合,找到最短的组合. 我这道题应用到的知识点: 1 Trie数据结构 2 map的应用 3 动态规划法Word Break的知识 4 递归剪枝法 思路: 1 建立Trie字典树.方便查找, 可是字典树不是使用字符来建立的.而是把字符转换成数字.建立一个数字字典树. 然后叶子节点设置一个容器vector<string>装原单词. 2 动态规划建立一个表,记录能够在字典树中找到的字符串的前缀子串 3 假设找到整个串都在字典树中,那么就能够直接返回这个单词…

1002. Phone Numbers Time limit: 2.0 secondMemory limit: 64 MB In the present world you frequently meet a lot of call numbers and they are going to be longer and longer. You need to remember such a kind of numbers. One method to do it in an easy way i…

In the present world you frequently meet a lot of call numbers and they are going to be longer and longer. You need to remember such a kind of numbers. One method to do it in an easy way is to assign letters to digits as shown in the following pictur…

题目 Volodya is an odd boy and his taste is strange as well. It seems to him that a positive integer number is beautiful if and only if it is divisible by each of its nonzero digits. We will not argue with this and just count the quantity of beautiful…

Problem Description Fermat's theorem states that for any prime number p and for any integer a > 1, a^p == a (mod p). That is, if we raise a to the pth power and divide by p, the remainder is a. Some (but not very many) non-prime values of p, known as…

Problem Description A number whose only prime factors are 2,3,5 or 7 is called a humble number. The sequence 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 24, 25, 27, ... shows the first 20 humble numbers. Write a program to find and pri…

Add Two Numbers: You are given two non-empty linked lists representing two non-negative integers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked list. You may assum…

Raising Modulo Numbers Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 6347   Accepted: 3740 Description People are different. Some secretly read magazines full of interesting girls' pictures, others create an A-bomb in their cellar, oth…

1009. K-based Numbers Time limit: 0.5 secondMemory limit: 64 MB Let’s consider K-based numbers, containing exactly N digits. We define a number to be valid if itsK-based notation doesn’t contain two successive zeros. For example: 1010230 is a valid 7…

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