The problem description and title have been updated.
After I submited my solution, return the message "While evaluating the solution, the server encountered an error caused by temporary unavailability of MATLAB Service. Wait a few minutes for the MATLAB Service to return, and then rescore.".
I have tried many times!!!
Return a list sorted by number of occurrences
Test for balanced parentheses
Distance walked 1D
surface of a spherical planet
Sum My Indices
create a square matrix
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