Assignment link reference

https://www.cs.cmu.edu/~adamchik/15-121/lectures/Recursions/recursions.html   Find a pair with the given difference Find whether an array is subset of another array | Added Method 3 https://stackoverflow.com/questions/21466924/how-do-i-determine-if-an-array-contains-all-the-integers-in-a-separate-array    

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