BiruLyu

5/25/2017 - 9:49 PM

```
/*In the following solution:
Iterate over 32 bits since its a 32-bit integer. This will be O(1) since it is in constant time
Left shift the number by i to get the LSB value
Do an AND of the number obtained from step 2 with 1. If the result of the AND is 1 then increment the count because the LSB value of that bit was 1.
*/
public int hammingWeight(int n) {
int count = 0;
for(int i=0; i<32; i++){
count += (n >> i & 1) == 1 ? 1: 0;
}
return count;
}
```

```
public class Solution {
// you need to treat n as an unsigned value
public int hammingWeight(int n) {
int count = 0;
while(n != 0){
n = n & (n-1);
count++;
}
return count;
}
}
```