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Guess there is a typo in the statement. If I understand the editorial correctly, {1, 2} may need to be replaced with {2, 3} and then {1} would be repalced with {2}.
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Array Partition
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Guess there is a typo in the statement. If I understand the editorial correctly, {1, 2} may need to be replaced with {2, 3} and then {1} would be repalced with {2}.