31. First Missing Positive
Return the smallest positive integer missing from an unsorted array in O(n) time and O(1) extra space.
範例 1:
輸入： nums = [1,2,0] 輸出： 3
範例 2:
輸入： nums = [3,4,-1,1] 輸出： 2
限制條件：
1 <= nums.length <= 10^5
● 已自動儲存第 1 行，第 1 欄
Return the smallest positive integer missing from an unsorted array in O(n) time and O(1) extra space.
輸入： nums = [1,2,0] 輸出： 3
輸入： nums = [3,4,-1,1] 輸出： 2
1 <= nums.length <= 10^5