At a minimum, you should make this problem variable. For example, find the element at the ith row and jth column and define i and j in the test cases, which are passed along with the function.
Distance walked 2D
Make one big string out of two smaller strings
Find out missing number from a vector of 9 elements
Sum the numbers on the main diagonal
Find the Nth Root of a Given Number
Determine whether the input is divisible by 3 as well as 5
find the mean of all elements in a matrix
Find the last digit
first element of matrix
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