Codeforces Round 917 (Div. 2) |
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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?
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 $$$2000$$$.
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).
34 101 2 3 44 71 4 3 46 182 4 3 7 6 7
Yes No Yes
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.
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