Not Equal: Everything in this space must be different. The answer is 6-1, placed vertically; 6-3, placed horizontally; 5-0, placed horizontally; 1-4, placed vertically; 2-4, placed horizontally.
int pivotIdx = partition(arr, low, high); // 分区并获取pivot位置
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The Space Launch System (SLS) rocket that will fly the Artemis II mission to the Moon
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