find a balance point in an array
array不是sorted的,裏面可能有負數。
解法也是從兩邊往中間搞,用兩個數組left和right存原數組從左向右和從右向左的元素和。然後按index來比較left和right兩個數組裏的元素,有相等的就是balance point.
find a balance point in an array
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find a balance point in an array
ted style 負數 mil spa arr 可能 point 兩個 array不是sorted的,裏面可能有負數。解法也是從兩邊往中間搞,用兩個數組left和right存原數組從左向右和從右向左的元素和。然後按index來比較left和right兩個數組裏的元素,有相
[LeetCode] 448.Find All Numbers Disappeared in an Array
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isa where xtra style 基本思想 我們 tput hat ice Given an array of integers where 1 ≤ a[i] ≤ n (n = size of array), some elements appear twice a
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red res cat leet pub ear index 意思 ++ 這兩道題很有意思,由於元素為1~n,因此每個元素的值-1(映射到0~n-1)就可以直接當做下標。這樣將 nums 中對應下標的元素 *-1 以i表示 index+1 這個元素出現過了,能節省存儲的空間
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