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Given an integer (signed 32 bits), write a function to check whether it is a power of 4. Example:Given num = 16, return true. Given num = 5, return fa 阅读全文
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Given an integer, write a function to determine if it is a power of three. Follow up:Could you do it without using any loop / recursion? 阅读全文
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Reverse a singly linked list. 阅读全文
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Given an integer n, return the number of trailing zeroes in n!. Note: Your solution should be in logarithmic time complexity. 此题是求阶乘后面零的个数。 阅读全文
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Write a function to delete a node (except the tail) in a singly linked list, given only access to that node. Supposed the linked list is 1 -> 2 -> 3 - 阅读全文
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在处理一道题目是，发现他们使用了List 中的set 方法，这个方法我平时很少用到，今天来研究一下，set和add的区别 add(int index,Object obj)方法与set(int index,Object e) 我们写一个例子： 结果： 阅读全文
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Given an array of size n, find the majority element. The majority element is the element that appears more than ⌊ n/2 ⌋ times. You may assume that the 阅读全文
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Given a linked list, determine if it has a cycle in it. Follow up:Can you solve it without using extra space? 参考博客：链表环状检测 阅读全文
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Given an index k, return the kth row of the Pascal's triangle. For example, given k = 3,Return [1,3,3,1]. Note:Could you optimize your algorithm to us 阅读全文
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Given numRows, generate the first numRows of Pascal's triangle. For example, given numRows = 5,Return solution： 阅读全文