731 B | 731 chars
import sys
from math import sqrt, pi, sin, factorial
from decimal import *
inp = input
# 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 f(a, b):
if a[0] < b[0] and a[1] > b[1]:
return True
if a[0] > b[0] and a[1] < b[1]:
return True
return False
def solve():
n = ii()
l = [mii() for _ in range(n)]
cnt = 0
for i in range(n):
for j in range(i + 1, n):
if(f(l[i], l[j])):
cnt += 1
return cnt
if __name__ == "__main__":
tc = ii()
for t in range(1, tc+1):
ret = solve()
p(f"Case #{t}: {ret}")