i need to write an algorithm to develop this math problem

Imagine two arrays, each given by: [1:1:100], overlap each other (See figure below). The “overlap depth” is random: a number, between 1 and 100. 11 Overlapping elements should be added together. Generate a plot of the resulting array from such a collision. You will notice something remarkable. This should be an exercise in array gymnastics.

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please help me i will be so happy :)

[mbonus]

The figure didn't attach

[s.p4m]

And please add more information.