Problem 3102. Rumis Scorer 4

This problem is very similar to Rumis Scorer 3. The main difference with this problem is that the board will not be completely filled in. In other words, the maximum heights designated by the stencil will not necessarily be occupied. Write a function to count the squares visible when viewed from above to determine who won each round (the stencil may or may not be helpful). See the test suite for additional examples (including test cases 1 and 2, which represent the completed boards shown below).