There is a city with $N$ numbered $0 - N-1$ shops. A market is a place where we can reach from one shop to another using some road. There are $M$ roads in this city connecting each connecting any two shops. 
Find the number of markets in the city.
NOTE:  A market having only one shop is also a valid market.

-----Input:-----
- First line will contain $T$, number of testcases. Then the testcases follow. 
- First line of Each Test Case is $N, M$, denoting the number of shops and the number of roads respectively.
- Next M lines consist of two integers $A$ and $B$ denoting that there exists a road between Shop A and Shop B

-----Output:-----
For each testcase, output the number of markets.

-----Constraints-----
- $1 \leq T \leq 100$
- $1 \leq N,M \leq 10^3$
- $0 \leq A,B < N$

-----Sample Input:-----
1
5 3
0 1
2 3
3 4

-----Sample Output:-----
2

```python

USER_FILENAME = "<user_code>"
import sys, json, builtins
import math, heapq, bisect, itertools, functools, collections, statistics, fractions, decimal, operator, array, random, re, string, os, pathlib
try:
    import resource as _res
except Exception:
    _res = None
from collections import Counter, defaultdict, deque, OrderedDict
from functools import lru_cache, reduce
from itertools import accumulate, permutations, combinations, product
from math import gcd, ceil, floor, sqrt
from decimal import Decimal
try:
    from typing import *
except Exception:
    pass
try:
    sys.setrecursionlimit(1_000_000)
except Exception:
    pass
try:
    import site as _site
    try:
        _sys_sites = _site.getsitepackages() if hasattr(_site, "getsitepackages") else []
        for _p in _sys_sites:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
    try:
        _usp = _site.getusersitepackages()
        if isinstance(_usp, str):
            _usp = [_usp]
        for _p in _usp:
            if _p and _p not in sys.path:
                sys.path.append(_p)
    except Exception:
        pass
except Exception:
    pass

ns = {"__name__": "__main__"}
for _k, _v in list(globals().items()):
    if not _k.startswith("_"):
        ns[_k] = _v
_CODE = 'for t in range(int(input())):\r\n    total=0\r\n    def check(n,store):\r\n        nonlocal edges,q,points\r\n        if n in store:\r\n            return\r\n        for i in range(q):\r\n            if n==edges[i][0]:\r\n                edges[i][0]=-1\r\n                x=edges[i][1]\r\n                edges[i][1]=-1\r\n                if x in points:\r\n                    check(x,store+[n])\r\n            elif n==edges[i][1]:\r\n                edges[i][1] = -1\r\n                x = edges[i][0]\r\n                edges[i][0] = -1\r\n                if x in points:\r\n                    check(x,store+[n])\r\n        points.remove(n)\r\n    n,q=list(map(int,input().split()))\r\n    edges=[]\r\n    points=[i for i in range(n)]\r\n    for i in range(q):\r\n        x=input().split()\r\n        edges.append([int(x[0]),int(x[1])])\r\n    for i in range(n):\r\n        if i in points:\r\n            total+=1\r\n            check(i,[])\r\n    print(total)\r\n'
_co = compile(_CODE, USER_FILENAME, "exec")
exec(_co, ns, ns)

```

Measured memory_bytes: