Leetcode Counting Bits 338
来源:互联网 发布:链表的定义node *next 编辑:程序博客网 时间:2024/06/05 21:56
Given a non negative integer number num. For every numbers i in the range 0 ≤ i ≤ num calculate the number of 1’s in their binary representation and return them as an array.
Example:
For num = 5 you should return [0,1,1,2,1,2].
Follow up:
It is very easy to come up with a solution with run time O(n*sizeof(integer)). But can you do it in linear time O(n) /possibly in a single pass?
Space complexity should be O(n).
Can you do it like a boss? Do it without using any builtin function like __builtin_popcount in c++ or in any other language.
题目链接
不让一个一个的计算
不允许使用已经有的库函数
被逼着查看之间的关系
每次添加的一位不是0就是1
vc[i] = vc[i/2] + (i%2)
class Solution {public: vector<int> countBits(int num) { vector<int> vc(num+1,0); for(int i=1;i<=num;i++){ vc[i]=vc[i/2]+(i%2); } return vc; }};
0 0
- leetcode:bits:Counting Bits(338)
- 【LeetCode-338】Counting Bits
- leetcode-338-Counting Bits
- Leetcode 338 Counting Bits
- LeetCode 338 :Counting Bits
- [leetcode-338]Counting Bits
- 【LeetCode-338】 Counting Bits
- LeetCode 338 Counting Bits
- Counting Bits leetcode 338
- [LeetCode 338] Counting Bits
- LeetCode-338:Counting Bits
- LeetCode-338:Counting Bits
- LeetCode[338] Counting Bits
- LeetCode#338 Counting Bits
- LeetCode 338 Counting Bits
- LeetCode 338 Counting Bits
- Leetcode #338 Counting Bits
- Leetcode 338 Counting Bits
- 信息检索概论总结
- 轻量级的ORM框架Peewee访问sqlite数据库
- 集合框架_产生10个1-20之间的随机数要求随机数不能重复案例
- eclipse中使用Maven创建Web项目
- 最近要读的一本书 《C++标准程序库》
- Leetcode Counting Bits 338
- 在javaweb中使用freemarker生成word文档
- java 总结几种线程异步转同步的方法
- 数据挖掘算法
- 最优分解问题
- Android setComponentEnabledSetting 对应文件
- 计算机间网络直连互传,速度慢的解决方案
- centos7安装Python3.5
- C语言固定大小的栈的操作