Buggy python submission (verdict: Runtime Error):
import sys
from collections import Counter
from math import ceil
def input():
    return sys.stdin.readline()[:-1]
def gcd(a,b):
    if b == 0:
        return a
    return gcd(b,a%b)
def main():
    N = int(input())
    P = []
    for _ in range(N):
        P.append(list(map(int,input().split())))
    K = []
    for k in range(N-1):
        for l in range(k+1,N):
            a, b, c, d = P[k][0], P[k][1], P[l][0], P[l][1]
            if [a,b] != [c,d]:
                e = c-a
                f = d-b
                while gcd(e,f) != 1:
                    t = gcd(e,f)
                    e //= t
                    f //= t
                K.append((e,f))
    C = Counter(K).most_common()
    print(max(1,N-C[0][1]))

if __name__ == '__main__':
    main()


Fixed submission:
from collections import Counter
N = int(input())
L = sorted([list(map(int,input().split())) for k in range(N)])
D = []
if N == 1:
    print(1)
    exit(0)
for k in range(N-1):
    for l in range(k+1,N):
        D.append((L[k][0]-L[l][0],L[k][1]-L[l][1]))

E = Counter(D).most_common()[0]
x, y = E[0][0], E[0][1]
used = []
ans = N
for k in range(N-1):
    for l in range(k+1,N):
        if L[k][0]-L[l][0] == x and L[k][1]-L[l][1] == y:
            if L[k] not in used and L[l] not in used:
                used.append(L[k])
                used.append(L[l])
                ans -= 1
            elif L[k] in used and L[l] not in used:
                used.append(L[l])
                ans -= 1
            elif L[k] not in used and L[l] in used:
                used.append(L[k])
                ans -= 1
            else:
                pass
print(ans)

Buggy python submission (verdict: Runtime Error):
from collections import Counter
N = int(input())
L = sorted([list(map(int,input().split())) for k in range(N)])
D = []

for k in range(N-1):
    for l in range(k+1,N):
        D.append((L[k][0]-L[l][0],L[k][1]-L[l][1]))

E = Counter(D).most_common()[0]
x, y = E[0][0], E[0][1]
used = []
ans = N
for k in range(N-1):
    for l in range(k+1,N):
        if L[k][0]-L[l][0] == x and L[k][1]-L[l][1] == y:
            if L[k] not in used and L[l] not in used:
                used.append(L[k])
                used.append(L[l])
                ans -= 1
            elif L[k] in used and L[l] not in used:
                used.append(L[l])
                ans -= 1
            elif L[k] not in used and L[l] in used:
                used.append(L[k])
                ans -= 1
            else:
                pass
print(ans)


Fixed submission:
from collections import Counter
N = int(input())
L = sorted([list(map(int,input().split())) for k in range(N)])
D = []
if N == 1:
    print(1)
    exit(0)
for k in range(N-1):
    for l in range(k+1,N):
        D.append((L[k][0]-L[l][0],L[k][1]-L[l][1]))

E = Counter(D).most_common()[0]
x, y = E[0][0], E[0][1]
used = []
ans = N
for k in range(N-1):
    for l in range(k+1,N):
        if L[k][0]-L[l][0] == x and L[k][1]-L[l][1] == y:
            if L[k] not in used and L[l] not in used:
                used.append(L[k])
                used.append(L[l])
                ans -= 1
            elif L[k] in used and L[l] not in used:
                used.append(L[l])
                ans -= 1
            elif L[k] not in used and L[l] in used:
                used.append(L[k])
                ans -= 1
            else:
                pass
print(ans)