670 B | 670 chars
import sys
from math import sqrt, pi, sin, factorial, ceil, floor
BLANK = " "
inp = input
# inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = BLANK : [*map(int,inp().split(x))]
mfi = lambda x = BLANK : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def solve():
n = ii()
l = [mii() for _ in range(n)]
mn = (0, 111111111)
for w, price in l:
if w * mn[1] > mn[0] * price:
mn = (w, price)
elif w * mn[1] == mn[0] * price:
if mn[1] > price:
mn = (w, price)
p(mn[1])
if __name__ == "__main__":
tc = ii()
for t in range(1, tc+1):
ret = solve()