albertotb

import math
from typing import Tuple

def pair_negative(x: int) -> int:
    return 2 * x if x >= 0 else -2 * x - 1

def unpair_negative(z: int) -> int:
    return int(z / 2) if z % 2 == 0 else int((z + 1) / -2)
    
def pair_szudzik(x: int, y: int) -> int: