For a given input string str, find how many spaces are there in the string and replace those spaces with *
e.g. str = 'this is demo of replacing spaces with stars';
out = 'this*is*demo*of*replacing*spaces*with*stars'
Maximum running product for a string of numbers
Vectorizing, too easy or too hard?
Back to basics - array operations
Sum of diagonals elements of a matrix
Create a v-notch vector without "sort" function
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