Buggy python submission (verdict: Runtime Error):
N = int(input())
xy = [list(map(int, input().split())) for _ in range(N)]

xy.sort()

ans = 0
while len(xy) > 2:
  rem_list = [[] for _ in range(N)]
  rem_cnt = 0
  rem_num = 0
  for i in range(1, N):
    p, q = xy[i][0] - xy[0][0], xy[i][1] - xy[0][1]
    cnt = 0
    for j in range(1, N):
      if p == 0 and xy[j][0] == xy[0][0] or q == 0 and xy[j][1] == xy[0][1]:
        cnt += 1
        rem_list[i].append(xy[j])
      elif p * q != 0 and (xy[j][0] - xy[0][0]) * p * (xy[j][1] - xy[0][1]) * q > 0 and (xy[j][0] - xy[0][0]) % p == 0 and (xy[j][1] - xy[0][1]) % q == 0:
        cnt += 1
        rem_list[i].append(xy[j])
    if rem_cnt < cnt:
      rem_cnt = cnt
      rem_num = i
  for r in rem_list[rem_num]:
    xy.remove(r)
  del xy[0]
  ans += 1

if len(xy) > 0:
  ans += 1
print(ans)

Fixed submission:
N = int(input())
xy = [list(map(int, input().split())) for _ in range(N)]

ans = float("inf")

if N < 3:
  ans = 1
else:   
  for i in range(N):
    x, y = xy[i][0], xy[i][1]
    for j in range(N):
      if i == j:
        continue
      p, q = xy[j][0] - x, xy[j][1] - y
      cnt = 0
      for k in range(N):
        xk, yk = xy[k][0], xy[k][1]
        for l in range(N):
          if k == l:
            continue
          if xy[l][0] - xk == p and xy[l][1] - yk == q:
            cnt += 1
      ans = min(ans, N - cnt)
print(ans)

Buggy python submission (verdict: Runtime Error):
N = int(input())
xy = [list(map(int, input().split())) for _ in range(N)]

xy.sort()

ans = 0
while len(xy) > 2:
  rem_list = [[] for _ in range(N)]
  rem_cnt = 0
  rem_num = 0
  for i in range(1, N):
    p, q = xy[i][0] - xy[0][0], xy[i][1] - xy[0][1]
    cnt = 0
    for j in range(1, N):
      if p == 0 and xy[j][0] == xy[0][0] or q == 0 and xy[j][1] == xy[0][1]:
        cnt += 1
        rem_list[j].append(xy[j])
      elif p != 0 and q != 0 and (xy[j][0] - xy[0][0]) % p == 0 and (xy[j][0] - xy[0][0]) * p > 0 and (xy[j][1] - xy[0][1]) % q == 0 and (xy[j][1] - xy[0][1]) * q > 0:
        cnt += 1
        rem_list[j].append(xy[j])
    if rem_cnt < cnt:
      rem_cnt = cnt
      rem_num = i
  for r in rem_list[rem_num]:
    xy.remove(r)
  del xy[0]
  ans += 1

if len(xy) > 0:
  ans += 1
print(ans)

Fixed submission:
N = int(input())
xy = [list(map(int, input().split())) for _ in range(N)]

ans = float("inf")

if N < 3:
  ans = 1
else:   
  for i in range(N):
    x, y = xy[i][0], xy[i][1]
    for j in range(N):
      if i == j:
        continue
      p, q = xy[j][0] - x, xy[j][1] - y
      cnt = 0
      for k in range(N):
        xk, yk = xy[k][0], xy[k][1]
        for l in range(N):
          if k == l:
            continue
          if xy[l][0] - xk == p and xy[l][1] - yk == q:
            cnt += 1
      ans = min(ans, N - cnt)
print(ans)

Buggy python submission (verdict: Runtime Error):
N = int(input())
xy = [list(map(int, input().split())) for _ in range(N)]

cnt = 0
while len(xy) > 0:
  tmp = xy.pop(0)
  if len(xy) == 0:
    cnt += 1
    break
  p, q = xy[0][0] - tmp[0], xy[0][1] - tmp[1]
  for l in xy:
    if p == 0 and abs(l[1] - tmp[1]) % q == 0 or q == 0 and abs(l[0] - tmp[0]) % p == 0 or abs(l[0] - tmp[0]) % p == 0 and abs(l[1] - tmp[1]) % q == 0:
      xy.remove(l)
  cnt += 1
print(cnt)

Fixed submission:
N = int(input())
xy = [list(map(int, input().split())) for _ in range(N)]

ans = float("inf")

if N < 3:
  ans = 1
else:   
  for i in range(N):
    x, y = xy[i][0], xy[i][1]
    for j in range(N):
      if i == j:
        continue
      p, q = xy[j][0] - x, xy[j][1] - y
      cnt = 0
      for k in range(N):
        xk, yk = xy[k][0], xy[k][1]
        for l in range(N):
          if k == l:
            continue
          if xy[l][0] - xk == p and xy[l][1] - yk == q:
            cnt += 1
      ans = min(ans, N - cnt)
print(ans)