You are given an array target of n integers. From a starting array arr consisting of n 1's, you may perform the following procedure :
x be the sum of all elements currently in your array.i, such that 0 <= i < n and set the value of arr at index i to x.Return true if it is possible to construct the target array from arr, otherwise, return false.
\n
Example 1:
\n\n\nInput: target = [9,3,5]\nOutput: true\nExplanation: Start with arr = [1, 1, 1] \n[1, 1, 1], sum = 3 choose index 1\n[1, 3, 1], sum = 5 choose index 2\n[1, 3, 5], sum = 9 choose index 0\n[9, 3, 5] Done\n\n\n
Example 2:
\n\n\nInput: target = [1,1,1,2]\nOutput: false\nExplanation: Impossible to create target array from [1,1,1,1].\n\n\n
Example 3:
\n\n\nInput: target = [8,5]\nOutput: true\n\n\n
\n
Constraints:
\n\nn == target.length1 <= n <= 5 * 1041 <= target[i] <= 109给你一个整数数组 target 。一开始，你有一个数组 A ，它的所有元素均为 1 ，你可以执行以下操作：
x 为你数组里所有元素的和0 <= i < target.size 的任意下标 i ，并让 A 数组里下标为 i 处的值为 x 。如果能从 A 开始构造出目标数组 target ，请你返回 True ，否则返回 False 。
\n\n
示例 1：
\n\n输入：target = [9,3,5]\n输出：true\n解释：从 [1, 1, 1] 开始\n[1, 1, 1], 和为 3 ，选择下标 1\n[1, 3, 1], 和为 5， 选择下标 2\n[1, 3, 5], 和为 9， 选择下标 0\n[9, 3, 5] 完成\n\n\n
示例 2：
\n\n输入：target = [1,1,1,2]\n输出：false\n解释：不可能从 [1,1,1,1] 出发构造目标数组。\n\n\n
示例 3：
\n\n输入：target = [8,5]\n输出：true\n\n\n
\n\n
提示：
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"editorType": "CKEDITOR",
"ugcQuestionId": null,
"style": "LEETCODE",
"exampleTestcases": "[9,3,5]\n[1,1,1,2]\n[8,5]",
"__typename": "QuestionNode"
}
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