That's a beautiful image.
The answer for the first image is wrong. It should be 54784197.
If one looks at the answer set, he/she will see people having been bypassing the first test by fixing the answer. The test cases should be fixed to calculate the sum dynamically with some function forbidden to the user.
Filter AC, pass DC
Sort numbers by outside digits
Return the first and last character of a string
Rotate input square matrix 90 degrees CCW without rot90
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