This problem requires more test cases. My solution as many others would fail for a case in which the searched substring is not ordered.
Determine if a Given Number is a Triangle Number
Sum of diagonal of a square matrix
Split a string into chunks of specified length
03 - Matrix Variables 2
Area of an Isoceles Triangle
Fermat's last theorem - again
Let's see how peculiar we can get
Generate Square Wave
row-th maximum row elements
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