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Problem
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.
Example1
Input: 2
Output: [0,1,1]
Example2
Input: 5
Output: [0,1,1,2,1,2]
Solution
class Solution {
public:vector<int> countBits(int num) {vector<int> f(num + 1);for (int i = 1; i <= num; i ++ )f[i] = f[i >> 1] + (i & 1);return f;}
};
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