In goodbye 2019 problem G , it is mentioned that suppose an array with n elements is given such that each element a_i is from (i-n) to (i-1) then there exist subset of the array whose sum is zero . How to prove it ?
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In goodbye 2019 problem G , it is mentioned that suppose an array with n elements is given such that each element a_i is from (i-n) to (i-1) then there exist subset of the array whose sum is zero . How to prove it ?
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Well, read the editorial. The existence of a solution is proof of your lemma.