Problem https://leetcode.com/problems/maximum-depth-of-binary-tree/Given a binary tree,...
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IP属地：华盛顿州
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104.[Tree][Easy] Maximum Depth of Binary Tree
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101.[Tree][Easy] Symmetric Tree
Problem https://leetcode.com/problems/symmetric-tree/ Given a binary tree, check whethe...
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100.[Tree][Easy] Same Tree
Problem https://leetcode.com/problems/same-tree/ Given two binary trees, write a functi...
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LeetCode Tree summary
Tree Summary Definition for a binary tree node. Binary Tree Traversal： Pre-order/ In-or...
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94.[Tree][Medium] Binary Tree Inorder Traversal
Problem https://leetcode.com/problems/binary-tree-inorder-traversal/Given a binary tree...
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Generics 泛型
泛型是JDK1.5之后增加。泛型的本质：数据类型的参数化。我们可以把泛型理解为数据类型的一个占位符（形式参数），即告诉编译器，在调用泛型时必须传入实际类型。 没有使用泛型时:...
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JDK8新特性之CompletableFuture详解
在JDK1.5已经提供了Future和Callable的实现,可以用于阻塞式获取结果,如果想要异步获取结果,通常都会以轮询的方式去获取结果,如下: 从上面的形式看来轮询的方式...
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大众点评基础架构部高级研发工程师，新美大移动端接入层shark负责人，新美大千万级实时在线用户消息推送系统负责人<br><br>intellij idea和vim的狂热爱好者，精通spring和netty<br><br>另外还喜欢唱歌和摄影，钢琴也能按出几个音节
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写不出Two Sum的程序员不是好程序员。。。
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28. Implement strStr() #String (Easy)
Problem:### Implement strStr().Returns the index of the first occurrence of needle in h...
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20. Valid Parentheses #Stack (Easy)
Problem:### Given a string containing just the characters '(', ')', '{', '}', '['and ']...
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C语言面试题
1.static关键字的作用？ 1)第一个作用：隐藏。当我们同时编译多个文件时，所有未加static前缀的全局变量和函数都具有全局可见性。 2)static的第二个作用是保持...
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14. Longest Common Prefix #String (Easy)
Problem:### Write a function to find the longest common prefix string amongst an array ...
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13. Roman to Integer #String (Easy)
Problem:### Given a roman numeral, convert it to an integer.Input is guaranteed to be w...
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6. ZigZag Conversion #String (Easy)
Problem:### The string "PAYPALISHIRING" is written in a zigzag pattern on a given numbe...
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Hash
Definition: a hash table (hash map) is a data structure used to implement an associativ...
