Tree Unattractiveness

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###Read problems statements in [Hindi](http://www.codechef.com/download/translated/CK100TST/hindi/TREEUNAT.pdf), [Mandarin Chinese](http://www.codechef.com/download/translated/CK100TST/mandarin/TREEUNAT.pdf), [Russian](http://www.codechef.com/download/translated/CK100TST/russian/TREEUNAT.pdf), [Vietnamese](http://www.codechef.com/download/translated/CK100TST/vietnamese/TREEUNAT...) and [Bengali](http://www.codechef.com/download/translated/CK100TST/bengali/TREEUNAT.pdf) as well. You are given a tree with $N$ vertices (numbered $1$ through $N$) and a bag with $N$ markers. There is an integer written on each marker; each of these integers is $0$, $1$ or $2$. You must assign exactly one marker to each vertex. Let's define the *unattractiveness* of the resulting tree as the maximum absolute difference of integers written on the markers in any two vertices which are connected by an edge. Find the minimum possible unattractiveness of the resulting tree. ### Input  The first line of the input contains a single integer $T$ denoting the number of test cases. The description of $T$ test cases follows.  The first line of each test case contains a single integer $N$.  The second line contains $N$ spaceseparated integers denoting the numbers on markers in the bag.  Each of the next $N1$ lines contains two spaceseparated integers $u$ and $v$ denoting an edge between vertices $u$ and $v$. ### Output For each test case, print a single line containing one integer — the minimum unattractiveness. ### Constraints  $1 \le T \le 30$  $1 \le N \le 100$  $1 \le u, v \le N$  the graph described on the input is a tree ### Example Input ``` 3 3 0 1 1 1 2 1 3 3 0 1 2 1 2 1 3 4 2 2 2 2 1 2 1 3 3 4 ``` ### Example Output ``` 1 1 0 ``` ### Explanation **Example case 1:**Author:  admin2 
Editorial  https://discuss.codechef.com/problems/TREEUNAT 
Tags  admin2, cook100, dynamicprogramming, medium, taran_1407, tree 
Date Added:  13112018 
Time Limit:  2 sec 
Source Limit:  50000 Bytes 
Languages:  C, CPP14, JAVA, PYTH, PYTH 3.6, PYPY, CS2, PAS fpc, PAS gpc, RUBY, PHP, GO, NODEJS, HASK, rust, SCALA, swift, D, PERL, FORT, WSPC, ADA, CAML, ICK, BF, ASM, CLPS, PRLG, ICON, SCM qobi, PIKE, ST, NICE, LUA, BASH, NEM, LISP sbcl, LISP clisp, SCM guile, JS, ERL, TCL, kotlin, PERL6, TEXT, SCM chicken, PYP3, CLOJ, COB, FS 
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