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 1: Input: 2 Output: [0,1,1] Example 2: Input: 5 Output: [0,1,1,2,1,2…

public class Solution { public int[] CountBits(int num) { ]; ; i <= num; i++) { ; var cur = i; do { ; ) { count++; } cur = cur / ; } ); ary[i] = count; } return ary; } } https://leetcode.com/problems/counting-bits/#/description 另一个版本,246ms: public cl…

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 1: Input: 2 Output: [0,1,1] Example 2: Input: 5 Output: [0,1,1,2,1,2…

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…

子集和问题:给定一组数和一个值,从这组数中选出若干个数使其和为给定的值.这是个NPC问题. 1.https://leetcode.com/problems/counting-bits/#/solutions 给定一非负Integer num,求[0,num]每个数的二进制形式中1的个数  f[num+1]. 解法:可用最朴素的方法逐个求,但其实有规律: f[i] = f[i / ] + i % 或  f[i] = f[i&(i-)] + ; 2.Single Number:一组Integer类型…