please someOne Explain sample test Cases for "Tower Construction" problem of hackerRank? Plzzz

problem link
in this problem, i am not able to understand even sample test cases, and there is no explanation for test cases in dissussion or editorial
if anyOne can understand problem, please help me to understand problem and sample test case
Please Help

Test case 1:
The two points that need to be added are (1, 1), (1, 2)

Test case 2:
The one point needed to be added is (2, 2)