576 B | 576 chars
import sys
from math import sqrt, pi, sin, factorial
inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = " " : [*map(int,inp().split(x))]
mfi = lambda x = " " : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def solve():
n, m = mii()
a = mii()
b = mii()
ans = 0
i = j = 0
while i < n and j < m:
if a[i] == b[j]:
ans += 1
i += 1
j += 1
elif a[i] < b[j]:
i += 1
else:
j += 1
p(ans)
if __name__ == "__main__":
tc = ii()
for t in range(1, tc+1):
solve()