651 B | 651 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():
x = y = 0
ans = []
mx = 0
while 1:
a, b = mii()
if a == b == 0:
break
x += a
y += b
if mx < x * x + y * y:
mx = x * x + y * y
ans = [x, y]
if mx == x * x + y * y and ans[0] < x:
ans = [x, y]
print(*ans)
if __name__ == "__main__":
tc = ii()
for t in range(1, tc+1):
ret = solve()