Buggy python submission (verdict: Runtime Error):
def main():
    MOD = 1_000_000_007
    N, M = map(int, input().split())
    a = [int(input()) for _ in range(M)]
    table = [1]*(N+1)
    for broken in a:
        table[broken] = 0
    table[1] = table[0] * table[1]
    if N > 1:
        for n in range(2, N+1):
            table[n] = ((table[n-2] + table[n-1]) * table[n]) % MOD
    print(table[-1])
main()

Fixed submission:
def main():
    MOD = 1000000007
    N, M = map(int, input().split())
    a = [int(input()) for _ in range(M)]
    table = [1]*(N+1)
    for broken in a:
        table[broken] = 0
    table[1] = table[0] * table[1]
    if N > 1:
        for n in range(2, N+1):
            table[n] = ((table[n-2] + table[n-1]) * table[n]) % MOD
    print(table[-1])
main()

Buggy python submission (verdict: Runtime Error):
def main():
    MOD = 1_000_000_007
    N, M = map(int, input().split())
    a = [int(input()) for _ in range(M)]
    table = [1]*(N+1)
    for broken in a:
        table[broken] = 0
    table[1] = table[0] * table[1]
    for n in range(2, N+1):
        table[n] = ((table[n-2] + table[n-1]) * table[n]) % MOD
    print(table[-1])
main()

Fixed submission:
def main():
    MOD = 1000000007
    N, M = map(int, input().split())
    a = [int(input()) for _ in range(M)]
    table = [1]*(N+1)
    for broken in a:
        table[broken] = 0
    table[1] = table[0] * table[1]
    if N > 1:
        for n in range(2, N+1):
            table[n] = ((table[n-2] + table[n-1]) * table[n]) % MOD
    print(table[-1])
main()

Buggy python submission (verdict: Runtime Error):
from math import factorial
MOD = 1_000_000_007

def calc_nCr(n, r):
    return (int(factorial(n) / (factorial(r) * factorial(n - r)))) % MOD
def count_patterns(stairs):
    if stairs == 0 or stairs == 1:
        return 1
    max_double_num = int(stairs/2)
    combs = [None]*(max_double_num+1)
    for i in range(max_double_num+1):
        double = i
        single = stairs - double*2
        n = double + single
        r = double
        nCr = calc_nCr(n, r)
        combs[i] = nCr
    return sum(combs) % MOD
  
N, M = map(int, input().split())
a = [int(input()) for _ in range(M)]

now = 0
total = 1

for broken in a:
    if broken <= now:
        print(0)
        break
    total = (total * count_patterns(broken-now-1)) % MOD
    now = broken + 1
else:
    total = (total * count_patterns(N-now)) % MOD
    print(total)


Fixed submission:
def main():
    MOD = 1000000007
    N, M = map(int, input().split())
    a = [int(input()) for _ in range(M)]
    table = [1]*(N+1)
    for broken in a:
        table[broken] = 0
    table[1] = table[0] * table[1]
    if N > 1:
        for n in range(2, N+1):
            table[n] = ((table[n-2] + table[n-1]) * table[n]) % MOD
    print(table[-1])
main()

Buggy python submission (verdict: Runtime Error):
from math import factorial

def calc_nCr(n, r):
    return int(factorial(n) / (factorial(r) * factorial(n - r)))
def count_patterns(stairs):
    if stairs == 0 or stairs == 1:
        return 1
    max_double_num = int(stairs/2)
    combs = [None]*(max_double_num+1)
    for i in range(max_double_num+1):
        double = i
        single = stairs - double*2
        n = double + single
        r = double
        nCr = calc_nCr(n, r)
        combs[i] = nCr
    return sum(combs) % MOD
  
N, M = map(int, input().split())
a = [int(input()) for _ in range(M)]

MOD = 1_000_000_007
now = 0
total = 1

for broken in a:
    if broken <= now:
        print(0)
        break
    total = (total * count_patterns(broken-now-1)) % MOD
    now = broken + 1
else:
    total = (total * count_patterns(N-now)) % MOD
    print(total)

Fixed submission:
def main():
    MOD = 1000000007
    N, M = map(int, input().split())
    a = [int(input()) for _ in range(M)]
    table = [1]*(N+1)
    for broken in a:
        table[broken] = 0
    table[1] = table[0] * table[1]
    if N > 1:
        for n in range(2, N+1):
            table[n] = ((table[n-2] + table[n-1]) * table[n]) % MOD
    print(table[-1])
main()