NVIDIA Verification Engineer interview questions

Puzzle: 2. There is a box with 13 W and 15 B balls. There are also 28 B balls on the outside. At each turn, two balls are randomly and simultaneously taken out of the box. If the balls are of different color, the W ball is returned to the box. If the balls are of the same color, they are removed and a B ball from outside is put into the box. After some turns, only one ball remains in the box. Can you deterministically tell the color of this ball?

Coding: 1. The two-sum problem (famous DSA problem), both on sorted and unsorted arrays. 2. In an array, for each number, find out if it is greater than all the numbers to the right of it. Then questions about time and space complexity of my solution.