feat: solve number of 1 bits

Author: GangBean

number-of-1-bits/GangBean.java

@@ -0,0 +1,11 @@
+class Solution {
+    public int hammingWeight(int n) {
+        int count = 0;
+        while (n >= 1) {
+            count += n % 2;
+            n /= 2;
+        }
+        return count;
+    }
+}
+