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re的都看过来！re十余次的忠告！每次向-1方向bfs的时候要判断大于零！小于零就不可能别搜！不然数组下标小于零re； 遇到n>=k的直接输出n-k！！！不然每次往后倒都有乘以2标记就算开100000000也会瞬间re！！ re十余次的忠告！ Followed by:
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