Problem p02679 (python)

Fixed submission:
from collections import Counter

def gcd(a, b):
    while b: a, b = b, a % b
    return abs(a)

MOD = 1000000007

# 2 WA
def main():
    N = int(input())
    d = {}
    d[(1,0)] = (0,0)
    z = 0
    for i in range(N):
      a,b = (int(x) for x in input().split())
      g = gcd(a,b)
      if g != 0:
        a = a//g
        b = b//g
        if a*b<0: a = -abs(a)
        elif a*b>0: a = abs(a)
      b = abs(b)
      
      if a*b==0:
        if a==b==0: z+=1
        elif b==0: d[(1,0)] = (d[(1,0)][0]+1,d[(1,0)][1])
        elif a==0: d[(1,0)] = (d[(1,0)][0],  d[(1,0)][1]+1)
      else:
        if (a,b) in d: d[(a,b)] = (d[(a,b)][0]+1,d[(a,b)][1])
        elif (b, -a) in d: d[(b,-a)] = (d[(b,-a)][0], d[(b,-a)][1]+1)
        elif (-b, a) in d: d[(-b,a)] = (d[(-b,a)][0], d[(-b,a)][1]+1)
        else: d[(a,b)] = (1,0)
    
    ans = 1
    for i, j in d.values():
      ans *= (pow(2,i,MOD) + pow(2,j,MOD) - 1)
      ans %= MOD

    print((ans-1+z)%MOD)

if __name__ == '__main__':
    main()

Buggy submission (verdict: Runtime Error):
from collections import Counter

def gcd(a, b):
    while b: a, b = b, a % b
    return abs(a)

MOD = 1000000007

def main():
    N = int(input())
    d = {}
    d[(1,0)] = (0,0)
    z = 0
    for i in range(N):
      a,b = (int(x) for x in input().split())
      g = gcd(a,b)
      a = a//g
      b = b//g
      if a*b<0: a = -abs(a)
      elif a*b>0: a = abs(a)
      b = abs(b)
      
      if a*b==0:
        if a==b==0:z+=1
        elif b==0: d[(1,0)] = (d[(1,0)][0]+1,d[(1,0)][1])
        elif a==0: d[(1,0)] = (d[(1,0)][0],  d[(1,0)][1]+1)
      else:
        if (a,b) in d: d[(a,b)] = (d[(a,b)][0]+1,d[(a,b)][1])
        elif (b, -a) in d: d[(b,-a)] = (d[(b,-a)][0],d[(b,-a)][1]+1)
        elif (-b, a) in d: d[(-b,a)] = (d[(-b,a)][0],d[(-b,a)][1]+1)
        else: d[(a,b)] = (1,0)
    
    ans = 1
    for i, j in d.values():
      ans *= (pow(2,i,MOD) + pow(2,j,MOD) - 1)
      ans %= MOD

    print(ans-1+z)

if __name__ == '__main__':
    main()

Buggy submission (verdict: Runtime Error):
from collections import Counter

def gcd(a, b):
    while b: a, b = b, a % b
    return abs(a)

MOD = 1000000007

def main():
    N = int(input())
    d = {}
    d[(1,0)] = (0,0)

    for i in range(N):
      a,b = (int(x) for x in input().split())
      g = gcd(a,b)
      a = a//g
      b = b//g
      if a*b<0: a = -abs(a)
      elif a*b>0: a = abs(a)
      b = abs(b)
      
      if a*b==0:
        if b==0: d[(1,0)] = (d[(1,0)][0]+1,d[(1,0)][1])
        elif a==0: d[(1,0)] = (d[(1,0)][0],d[(1,0)][1]+1)
      else:
        if (a,b) in d: d[(a,b)] = (d[(a,b)][0]+1,d[(a,b)][1])
        elif (b, -a) in d: d[(b,-a)] = (d[(b,-a)][0],d[(b,-a)][1]+1)
        elif (-b, a) in d: d[(-b,a)] = (d[(-b,a)][0],d[(-b,a)][1]+1)
        else: d[(a,b)] = (1,0)
    
    ans = 1
    for i, j in d.values():
      ans *= (pow(2,i,MOD) + pow(2,j,MOD) - 1)
      ans %= MOD

    print(ans-1)

if __name__ == '__main__':
    main()

Buggy submission (verdict: Runtime Error):
from collections import Counter

def gcd(a, b):
    while b: a, b = b, a % b
    return abs(a)

MOD = 1000000007

def main():
    N = int(input())
    d = {}
    d[(1,0)] = (0,0)

    for i in range(N):
      a,b = (int(x) for x in input().split())
      g = gcd(a,b)
      a = a//g
      b = b//g
      if a*b<0:
        a = -abs(a)
        b = abs(b)
      elif a*b > 0:
        a = abs(a)
        b = abs(b)
      
      if a*b == 0:
        if b==0: d[(1,0)] = (d[(1,0)]+1,d[(1,0)])
        elif a==0: d[(1,0)] = (d[(1,0)],d[(1,0)]+1)
      else:
        if (a,b) in d: d[(a,b)] = (d[(a,b)][0]+1,d[(a,b)][1])
        elif (b, -a) in d: d[(b,-a)] = (d[(b,-a)][0],d[(b,-a)][1]+1)
        elif (-b, a) in d: d[(-b,a)] = (d[(-b,a)][0],d[(-b,a)][1]+1)
        else: d[(a,b)] = (1,0)
    
    ans = 1
    for i, j in d.values():
      ans *= (pow(2,i,MOD) + pow(2,j,MOD) - 1)
      ans %= MOD

    print(ans-1)

if __name__ == '__main__':
    main()