[Java trivia crazy] Given a non-empty array of integers, each element appears twice except for a certain element that appears only once. Find the element that appears only once.

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[Java trivia crazy] Given a non-empty array of integers, each element appears twice except for a certain element that appears only once. Find the element that appears only once.

Java Given a non-empty array of integers, each element appears twice except one that appears only once. Find the element that appears only once.

Given a non-empty array of integers, each element appears twice except one that appears only once. Find the element that appears only once. 【LeetCode Hot 100】

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