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.
Word Counting and Indexing
Check if number exists in vector
Find Index of maximum Value and maximum Value of a vector
Do Fast Fourier Transformation
07 - Common functions and indexing 1
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