题目描述
You are given an array of integers $l_1, l_2, \dots, l_n$ and an integer $d$. Is it possible to construct a tree satisfying the following three conditions?
- The tree contains $n + 1$ nodes.
- The length of the $i$-th edge is equal to $l_i$.
- The (weighted) diameter of the tree is equal to $d$.
Input
Each test consists of multiple test cases. The first line contains a single integer $t$ ($1 \leq t \leq 250$) — the number of test cases. The description of the test cases follows.
The first line of each test case contains two integers $n$, $d$ ($2 \leq n \leq 2000, 1 \leq d \leq 2000$).
The second line of each test case contains $n$ integers $l_1, l_2, \dots, l_n$ ($1 \leq l_i \leq d$).
It is guaranteed that the sum of $n$ over all test cases does not exceed $2000$.
Output
For each test case, output $\texttt{Yes}$ if it is possible to construct a tree that satisfies all the conditions, and $\texttt{No}$ otherwise.
You can print the letters in any case (upper or lower).
输入格式
见题面 Input 部分
输出格式
见题面 Output 部分
样例输入
样例输出
提示
Below, you are given the illustrations of trees for the first and third test cases. One of the diameters is highlighted by coloring its edges in red.