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.
Test for balanced parentheses
Multiply 2 numbers
Concatenate two strings
Sum of series
Number Puzzle - 078
When the sum of the squares is a cubic...
Number Puzzles - 002
When the sum of the cubes is a quartic...
Number Puzzles - 004
Number Puzzle - 089
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