Buggy python submission (verdict: Runtime Error):
import sys
sys.setrecursionlimit(100000)

N, M = map(int, input().split())
a_list = [int(input()) for _ in range(M)]

mod = 1000000007
  
ans = 1
result = {0:1, 1:1}

def fib(x):
    if(result.get(x)):
        return result.get(x)
    
    if x == 0 or x == 1:
        return result[x]
    else:
        a = fib(x - 1)
        result[x-1] = a
        b = result.get(x-2)
        
        return a + b

x = 0

for a in a_list:
    if a == x:
        ans = 0
        break
    
    ans = (ans * fib((a-1)-x)) % mod
    x = a+1
else:
    ans = (ans * fib(N-x)) % mod

print(ans)

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

mod = 1000000007

DP = [-1] * (N + 1) 
DP[0] = 1 
DP[1] = 1 

def fib(n):
    for i in range(2, n + 1):
        DP[i] = DP[i-1] + DP[i-2]
    
    return DP[n]

ans = 1
x = 0

for a in a_list:
    if a == x:
        ans = 0
        break
    
    ans = (ans * fib((a-1)-x)) % mod
    x = a+1
else:
    ans = (ans * fib(N-x)) % mod
    
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
N, M = map(int, input().split())
a_list = [int(input()) for _ in range(M)]

mod = 1000000007

result = [-1]*(N+1)

result[0] = 1
result[1] = 1

for a in a_list:
    result[a] = 0

for i in range(2, N+1):
    if i not in a_list:
        result[i] = (result[i-1]+result[i-2])%mod
        if result[i] == 0:
            result[-1] = 0
            break
    
print(result[-1])

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

mod = 1000000007

DP = [-1] * (N + 1) 
DP[0] = 1 
DP[1] = 1 

def fib(n):
    for i in range(2, n + 1):
        DP[i] = DP[i-1] + DP[i-2]
    
    return DP[n]

ans = 1
x = 0

for a in a_list:
    if a == x:
        ans = 0
        break
    
    ans = (ans * fib((a-1)-x)) % mod
    x = a+1
else:
    ans = (ans * fib(N-x)) % mod
    
print(ans)

Buggy python submission (verdict: Time Limit Exceeded):
N, M = map(int, input().split())
a_list = [int(input()) for _ in range(M)]

mod = 1000000007

result = []

for i in range(N+1):
    if i in a_list:
        result += [0]
    elif i == 0 or i == 1:
        result += [1]
    else:
        result += [(result[i-1]+result[i-2]) % mod]
        
print(result[-1])

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

mod = 1000000007

DP = [-1] * (N + 1) 
DP[0] = 1 
DP[1] = 1 

def fib(n):
    for i in range(2, n + 1):
        DP[i] = DP[i-1] + DP[i-2]
    
    return DP[n]

ans = 1
x = 0

for a in a_list:
    if a == x:
        ans = 0
        break
    
    ans = (ans * fib((a-1)-x)) % mod
    x = a+1
else:
    ans = (ans * fib(N-x)) % mod
    
print(ans)

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

mod = 1000000007
  
ans = 1
result = {0:1, 1:1}

def fib(x):
    if x == 0 or x == 1:
        return result[x]
    else:
        a = result.get(x-1) if result.get(x-1) else fib(x - 1)
        result[x-1] = a
        b = result.get(x-2)
        
        return a + b

x = 0

for a in a_list:
    if a == x:
        ans = 0
        break
    
    ans = (ans * fib((a-1)-x)) % mod
    x = a+1
else:
    ans = (ans * fib(N-x)) % mod

print(ans)

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

mod = 1000000007

DP = [-1] * (N + 1) 
DP[0] = 1 
DP[1] = 1 

def fib(n):
    for i in range(2, n + 1):
        DP[i] = DP[i-1] + DP[i-2]
    
    return DP[n]

ans = 1
x = 0

for a in a_list:
    if a == x:
        ans = 0
        break
    
    ans = (ans * fib((a-1)-x)) % mod
    x = a+1
else:
    ans = (ans * fib(N-x)) % mod
    
print(ans)

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

mod = 1000000007
  
ans = 1

def fib(x):
    if x == 0 or x == 1:
        return 1
    else:
        return (fib(x - 1) + fib(x - 2))

x = 0

for a in a_list:
    if a == x:
        ans = 0
        break
    
    ans = (ans * fib((a-1)-x)) % mod
    x = a+1
else:
    ans = (ans * fib(N-x)) % mod

print(ans)

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

mod = 1000000007

DP = [-1] * (N + 1) 
DP[0] = 1 
DP[1] = 1 

def fib(n):
    for i in range(2, n + 1):
        DP[i] = DP[i-1] + DP[i-2]
    
    return DP[n]

ans = 1
x = 0

for a in a_list:
    if a == x:
        ans = 0
        break
    
    ans = (ans * fib((a-1)-x)) % mod
    x = a+1
else:
    ans = (ans * fib(N-x)) % mod
    
print(ans)