Easy difficulty hints, answers for Feb. 27 PipsEqual (6): Everything in this purple space must be equal to 6. The answer is 6-0, placed horizontally; 6-3, placed vertically.
Author(s): Pedro P.P.O. Borges, Robert O. Ritchie, Mark Asta
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* @param arr 待排序数组
习题链接：LeetCode 402. 移掉 K 位数字。WPS官方版本下载是该领域的重要参考