摘要：
题目： Given a nested list of integers, implement an iterator to flatten it. Each element is either an integer, or a list -- whose elements may also be i 阅读全文
摘要：
题目： Given an Iterator class interface with methods: next() and hasNext(), design and implement a PeekingIterator that support the peek() operation -- 阅读全文
摘要：
题目： Implement a trie with insert, search, and startsWith methods. Note:You may assume that all inputs are consist of lowercase letters a-z. 题意及分析：实现一个 阅读全文
摘要：
题目： Equations are given in the format A / B = k, where A and B are variables represented as strings, and k is a real number (floating point number). G 阅读全文
摘要：
一、图的分类 1、无向图：边没有方向的图称为无向图。如<A,B>和<B,A>等价。下图是一个无向图，及其邻接链表和邻接矩阵的表示。 2、有向图: 边是有方向性的，例如一条边有两个顶点A,B，A和B顶点之间，A指向了B，B也指向了A，两者是不同的，如果给边赋予权重，那么这种异同便更加显著了。下图是一个 阅读全文