I had a recent interview where I was asked three relatively easy LeetCode problems, and I felt confident in my performance.

The interview went well, and I received positive feedback from the interviewers. However, despite my strong performance, I was ultimately waitlisted due to my visa status.

It seems that while they appreciated my skills and were interested in my potential as a candidate, the company's considerations around my current visa situation led them to place me on hold for now.

Count the number of 1 bits in an integer.