Add Balancing elements problem solving#7

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rica-v3 wants to merge 10 commits intomasterfrom

balancing-elements

Commits on May 10, 2020

Add BalancingElements with O(n^2)
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Add break condition not to traverse all
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Remove duplicate code
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Rename local var
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Add problem description
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Check the sum is even number except a deleted element
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Move checking the sum of the rest elements to isBalanced
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Optimize isBalanced time-complexity to constant time from O(n) by using partialSum cache
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Add method description
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Add doucument about how to rebuild partialSum
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