Your test case doesn't match up with the problem statement. The problem statement mentions monotonically decreasing, while the test case tests for just decreasing.
Who Has the Most Change?
Back to basics 8 - Matrix Diagonals
Area of an equilateral triangle
Can the given sides form a triangle?
Number Puzzle - 087
Calculating Ring Area
Matrix Pattern 6
A Simple Shielding Problem
Area of Cylindrical Shell
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