reverse string with out using any java inbuilt function. design the online grocery retails shopping application. design patterns singleton, factory, abstract factory etc. all java basics comparator/camparable, hash map, custom hashing algo, immutable class, internal implementation of hash map, hash set.
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I/p : Array of 10 numbers. O/p : lol possible different pairs that give same sum. E. G. (1,2,3,4,5,6,7,8,9,10) => (2-3, 1-4), so on
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