Complement Spanning Trees
All submissions for this problem are available.### Read problem statements in [Hindi](http://www.codechef.com/download/translated/AUG19/hindi/CSTREE.pdf), [Bengali](http://www.codechef.com/download/translated/AUG19/bengali/CSTREE.pdf), [Mandarin Chinese](http://www.codechef.com/download/translated/AUG19/mandarin/CSTREE.pdf), [Russian](http://www.codechef.com/download/translated/AUG19/russian/CSTREE.pdf), and [Vietnamese](http://www.codechef.com/download/translated/AUG19/vietnamese/CSTREE.pdf) as well. You are given a small graph $G_s$ with $N$ nodes (numbered $1$ through $N$) and $M$ edges. Let's create a big graph $G_b$ with $NK$ nodes (numbered $1$ through $NK$) and $MK$ edges. $G_b$ consists of $K$ copies of $G_s$ ― formally, for each $k$ ($0 \le k \le K-1$) and each edge between nodes $u$ and $v$ in $G_s$, there is an edge between nodes $u+kN$ and $v+kN$ in $G_b$. Afterwards, let's take the complement of $G_b$ and call it $H$ ― formally, $H$ is a graph with $NK$ nodes (numbered $1$ through $NK$) such that for each pair of nodes, there is an edge between these two nodes in $H$ if and only if there is no edge between these two nodes in $G_b$. Count the number of spanning trees in $H$. Since this number could be very large, compute it modulo $998,244,353$. ### 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 three space-separated integers $N$, $M$ and $K$. - Each of the next $M$ lines contains two space-separated integers $a$ and $b$ denoting that the nodes $a$ and $b$ in $G_s$ are connected by an edge. ### Output For each test case, print a single line containing one integer ― the number of spanning trees in $H$ modulo $998,244,353$. ### Constraints - $1 \le T \le 20$ - $1 \le N \le 30$ - $0 \le M \le N(N-1)/2$ - $1 \le K \le 10^8$ - $1 \le a, b \le N$ - $G_s$ does not contain any self-loops or multi-edges ### Subtasks **Subtask #1 (15 points):** $K \le 10$ **Subtask #2 (19 points):** - $K \le 50$ - $M \le 5$ **Subtask #3 (21 points):** - $K \le 5,000$ - $M = N(N-1)/2$ **Subtask #4 (22 points):** $K \le 5,000$ **Subtask #5 (23 points):** original constraints ### Example Input ``` 5 3 0 1 3 3 2 1 2 1 3 2 3 3 3 1 1 2 1 3 2 3 6 9 20 1 3 2 3 4 3 5 3 6 3 1 4 2 4 4 5 4 6 30 4 5000 1 2 3 4 5 6 6 7 ``` ### Example Output ``` 3 81 0 13872131 797280964 ``` ### Explanation **Example case 1:** $H$ is the complete graph on three nodes, so the number of spanning trees is $3$ (any two of the edges form a spanning tree).
|Tags||algebra, aug19, fft, hard, interpolation, kirchoffs-theorem, lg5293, polynomial, vijju123|
|Time Limit:||3 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, SQL, kotlin, PERL6, TEXT, SCM chicken, PYP3, CLOJ, R, COB, FS|
Fetching successful submissions
If you are still having problems, see a sample solution here.