Buggy python submission (verdict: Runtime Error):
N = int(input())
A = list(map(int, input().split()))

A = sorted(A)

count_m = 0
count_z = 0
count_p = 0
sum_abs = 0

for i in range(N):
    if A[i] < 0:
        count_m += 1
        sum_abs -= A[i]
    elif A[i] == 0:
        count_z += 1
    else:
        count_p += 1
        sum_abs += A[i]

if count_m + count_z == 0:
    print(sum_abs-2*min(A))
    tmp = A[0]
    for i in range(N-2):
        print(tmp, A[i+1])
        tmp -= A[i+1]
    print(A[-1], tmp)

elif count_p + count_z == 0:
    print(sum_abs+2*max(A))
    tmp = A[-1]
    for i in range(N-1):
        print(tmp, A[i])
        tmp -= A[i]

elif count_p + count_m == 0:
    print(0)
    for i in range(N-1):
        print(0, 0)

elif count_z > 0:
    print(A[2*N])
    print(sum_abs)
    cmz = count_m + count_z
    tmp = A[-1]
    for i in range(cmz - 1):
        print(tmp, A[i])
        tmp -= A[i]
    tmp_2 = A[cmz-1]
    for i in range(count_p-1):
        print(tmp_2, A[i+cmz])
        tmp_2 -= A[i+cmz]
    print(tmp, tmp_2)

elif count_z == 0:
    print(sum_abs)
    cmz = count_m + count_z
    tmp = A[-1]
    for i in range(cmz - 1):
        print(tmp, A[i])
        tmp -= A[i]
    tmp_2 = A[cmz-1]
    for i in range(count_p-1):
        print(tmp_2, A[i+cmz])
        tmp_2 -= A[i+cmz]
    print(tmp, tmp_2)

Fixed submission:
N, K = map(int, input().split())
if K == 1:
    print(0)
else:
    print(N-K)

Buggy python submission (verdict: Runtime Error):
N = int(input())
A = list(map(int, input().split()))

A = sorted(A)

count_m = 0
count_z = 0
count_p = 0
sum_abs = 0

for i in range(N):
    if A[i] < 0:
        count_m += 1
        sum_abs -= A[i]
    elif A[i] == 0:
        count_z += 1
    else:
        count_p += 1
        sum_abs += A[i]

if count_m + count_z == 0:
    print(sum_abs-2*min(A))
    tmp = A[0]
    for i in range(N-2):
        print(tmp, A[i+1])
        tmp -= A[i+1]
    

elif count_p + count_z == 0:
    print(sum_abs+2*max(A))
    tmp = A[-1]
    for i in range(N-1):
        print(tmp, A[i])
        tmp -= A[i]

elif count_p + count_m == 0:
    print(0)
    for i in range(N-1):
        print(0, 0)

else:
    print(A[2*N])
    print(sum_abs)
    cmz = count_m + count_z
    tmp = A[-1]
    for i in range(cmz - 1):
        print(tmp, A[i])
        tmp -= A[i]
    tmp_2 = A[cmz-1]
    for i in range(count_p-1):
        print(tmp_2, A[i+cmz])
        tmp_2 -= A[i+cmz]
    print(tmp, tmp_2)

Fixed submission:
N, K = map(int, input().split())
if K == 1:
    print(0)
else:
    print(N-K)

Buggy python submission (verdict: Runtime Error):
import sys
from fractions import gcd
N = int(input())
arr = []

def get_unique_list(seq):
    seen = []
    return [x for x in seq if x not in seen and not seen.append(x)]

for i in range(N):
    arr.append(list(map(int, input().split())))

if N == 1:
    print(1)
    sys.exit()

C = []
for i in range(N):
    for j in range(N):
        if i < j:
            x = arr[i][0]-arr[j][0]
            y = arr[i][1]-arr[j][1]
            g = gcd(x, y)
            x = int(x / g)
            y = int(y / g)
            C.append([x, y])

C = get_unique_list(C)
S = [0 for i in range(len(C))]

for c in range(len(C)):
    tmp = [[arr[0][0], arr[0][1]]]
    for i in range(1, N):
        l = len(tmp)
        for j in range(l):
            if C[c][0] == 0:
                if (tmp[j][1] - arr[i][1])%C[c][1] == 0:
                    pass
                else:
                    tmp.append([arr[i][0], arr[i][1]])

            elif C[c][1] == 0:
                if (tmp[j][0] - arr[i][0])%C[c][0] == 0:
                    pass
                else:
                    tmp.append([arr[i][0], arr[i][1]])
            else:
                if (tmp[j][0] - arr[i][0])%C[c][0] == 0 and (tmp[j][1] - arr[i][1])%C[c][1] == 0:
                    pass
                else:
                    tmp.append([arr[i][0], arr[i][1]])
    S[c] = len(tmp)

print(min(S))


Fixed submission:
N, K = map(int, input().split())
if K == 1:
    print(0)
else:
    print(N-K)