in this question it's not so fast compare to others' since not used the previous answer in each iteration

but quite interesting to compute one single number parallelly

```
class Solution {
public:
vector<int> countBits(int num) {
vector<int> result;
for(int i=0;i<=num;++i){
result.push_back(countBit(i));
}
return result;
}
int countBit(int num){
int b = ( ( (num & 0xAAAAAAAA) >> 1) + (num & 0x55555555) );
int c = ( ( (b & 0xCCCCCCCC) >> 2) + (b & 0x33333333) );
int d = ( ( (c & 0xF0F0F0F0) >> 4) + (c & 0x0F0F0F0F) );
int e = ( ( (d & 0xFF00FF00) >> 8) + (d & 0x00FF00FF) );
int f = ( ( (e & 0xFFFF0000) >> 16)+ (e & 0x0000FFFF) );
return f;
}
};
```