Reverse digits of a number.
For example, return 321 for the input 123 .
The left-hand zeros can be discarded. For example, input 10 will return 1 .
surface of a spherical planet
Make one big string out of two smaller strings
First non-zero element in each column
Who knows the last digit of pi?
Area of a circle
Check if two matrices are permutations of each other
Check if a rotated array was originally sorted
Check if a matrix is a palindrome in all directions
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