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【leetcode】448. Find All Numbers Disappeared in an Array
時間 2021-07-12
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題目如下: 解題思路:本題對時間複雜度和空間複雜度都有要求,特別是空間,所以不能用字典之類的來記錄已經出現的值。這裏可以採用值-下標映射的方法,即把所有元素移動到其值減1的對應的下標的位置上,移動完成後,下標和值不匹配的元素即爲缺失的number。例如輸入[4,3,2,7,8,2,3,1], [4, 3, 2, 7, 8, 2, 3, 1] # 初始狀態 [7, 3, 2, 4, 8, 2, 3,
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