617 B | 617 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())
def solve():
n = ii()
l = [mii() for _ in range(n)]
l2 = [[], []]
for i, j in l:
l2[i].append(j)
l2[0].sort(reverse=True)
l2[1].sort(reverse=True)
l = l2[0] + l2[1]
ans = 0
for i in range(1, n):
ans = max(ans, abs(l[i] - l[i - 1]))
print(ans)
if __name__ == "__main__":
tc = 1
for t in range(tc):
solve()