CF1851D.Prefix Permutation Sums
普及/提高-
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题目描述
Your friends have an array of n elements, calculated its array of prefix sums and passed it to you, accidentally losing one element during the transfer. Your task is to find out if the given array can matches permutation.
A permutation of n elements is an array of n numbers from 1 to n such that each number occurs exactly one times in it.
The array of prefix sums of the array a — is such an array b that bi=∑j=1iaj,1≤i≤n .
For example, the original permutation was [1,5,2,4,3] . Its array of prefix sums — [1,6,8,12,15] . Having lost one element, you can get, for example, arrays [6,8,12,15] or [1,6,8,15] .
It can also be shown that the array [1,2,100] does not correspond to any permutation.
输入格式
The first line contains a positive number t ( 1≤t≤104 ) — the number of test cases. The description of the test cases follows.
The first line of the description of each test case contains a positive number n ( 2≤n≤2⋅105 ) — the size of the initial array.
The second line of the description of each test case contains n−1 positive number ai ( 1≤ai≤1018 ), ai−1<ai — elements of the array of prefix sums.
It is guaranteed that the sum of n over all test cases does not exceed 2⋅105 .
输出格式
For each test case, output "YES" if such a permutation exists, and "NO" otherwise.
You can output "YES" and "NO" in any case (for example, the strings "yEs", "yes" and "Yes" will be recognized as a positive response).
输入输出样例
输入#1
12 5 6 8 12 15 5 1 6 8 15 4 1 2 100 4 1 3 6 2 2 3 1 2 4 3 7 10 5 5 44 46 50 4 1 9 10 5 13 21 36 42 5 1 2 3 1000000000000000000 9 9 11 12 20 25 28 30 33
输出#1
YES YES NO YES YES NO YES NO NO NO NO NO
说明/提示
In the fourth example, for example, the permutation [1,2,3,4] is suitable. In the fifth example, for example, the permutation [2,1] is suitable. In the seventh example, for example, the permutation [1,2,4,3] is suitable.