Buggy python submission (verdict: Time Limit Exceeded):
N,M=map(int,input().split())
mod=10**9+7
dp=[0 for i in range(N+1)]
dp[0]=1
dp[-1]=0
A=[]
for i in range(M):
  A.append(int(input()))
#print(A)
for i in range(1,N+1):
  if dp[i-1]==0 and dp[i-2]==0:
    break
  elif i in A:
    continue
  else:
    dp[i]=(dp[i-1]+dp[i-2])%mod
print(dp[N]%mod)


Fixed submission:
N,M=map(int,input().split())
mod=10**9+7
dp=[0]*(N+1)
dp[0]=1
dp[-1]=0
A=[]
for i in range(M):
  A.append(int(input()))
A=set(A)
#print(A)
for i in range(1,N+1):
  if dp[i-1]==0 and dp[i-2]==0:
    break
  elif i in A:
    continue
  else:
    dp[i]=(dp[i-1]+dp[i-2])%mod
print(dp[N]%mod)

Buggy python submission (verdict: Time Limit Exceeded):
N,M=map(int,input().split())
mod=10**9+7
dp=[0 for i in range(N+1)]
dp[0]=1
dp[-1]=0
A=[]
for i in range(M):
  A.append(int(input()))
#print(A)
for i in range(1,N+1):
  if i in A:
    continue
  else:
    dp[i]=(dp[i-1]+dp[i-2])%mod
print(dp[N]%mod)


Fixed submission:
N,M=map(int,input().split())
mod=10**9+7
dp=[0]*(N+1)
dp[0]=1
dp[-1]=0
A=[]
for i in range(M):
  A.append(int(input()))
A=set(A)
#print(A)
for i in range(1,N+1):
  if dp[i-1]==0 and dp[i-2]==0:
    break
  elif i in A:
    continue
  else:
    dp[i]=(dp[i-1]+dp[i-2])%mod
print(dp[N]%mod)

Buggy python submission (verdict: Time Limit Exceeded):
N,M=map(int,input().split())
mod=10**9+7
A=[]
for i in range(M):
  A.append(int(input()))
#print(A)
next=0
dp=[0 for i in range(N+1)]
dp[0]=1
dp[-1]=0
for i in range(1,N+1):
  if i in A:
    if next==1:
      break
    else:
      dp[i]=1
      next=1
  elif next==1:
    dp[i]=dp[i-2]
    next=2
  elif next==2:
    dp[i]=dp[i-1]
    next=0
  else:
    dp[i]=(dp[i-1]+dp[i-2])%mod
print(dp[N]%mod)



Fixed submission:
N,M=map(int,input().split())
mod=10**9+7
dp=[0]*(N+1)
dp[0]=1
dp[-1]=0
A=[]
for i in range(M):
  A.append(int(input()))
A=set(A)
#print(A)
for i in range(1,N+1):
  if dp[i-1]==0 and dp[i-2]==0:
    break
  elif i in A:
    continue
  else:
    dp[i]=(dp[i-1]+dp[i-2])%mod
print(dp[N]%mod)

Buggy python submission (verdict: Time Limit Exceeded):
N,M=map(int,input().split())
mod=10**9+7
n1=-1
n2=-1
stop=0
A=[]
for i in range(M):
  n1=n2
  n2=int(input())
  if n2-n1==1:
    stop=1
  A.append(n2)
#print(A,stop,sep="おい")
if stop==1:
  print("0")
else:
  next=0
  dp=[0 for i in range(N+1)]
  dp[0]=1
  dp[-1]=0
  for i in range(1,N+1):
    if i in A:
      dp[i]=1
      next=1
    elif next==1:
      dp[i]=dp[i-2]
      next=2
    elif next==2:
      dp[i]=dp[i-1]
      next=0
    else:
      dp[i]=(dp[i-1]+dp[i-2])%mod
  print(dp[N]%mod)


Fixed submission:
N,M=map(int,input().split())
mod=10**9+7
dp=[0]*(N+1)
dp[0]=1
dp[-1]=0
A=[]
for i in range(M):
  A.append(int(input()))
A=set(A)
#print(A)
for i in range(1,N+1):
  if dp[i-1]==0 and dp[i-2]==0:
    break
  elif i in A:
    continue
  else:
    dp[i]=(dp[i-1]+dp[i-2])%mod
print(dp[N]%mod)

Buggy python submission (verdict: Runtime Error):
N,M=map(int,input().split())
mod=10**9+7
n1=0
n2=0
A=[]
for i in range(M):
  n1=n2
  n2=int(input())
  #print(n2-n1+1)
  A.append(n2-n1-2)
A.append(N-n2-1)
if A[0]==-1:
  A.pop(0)
else:
  A[0]=A[0]+1
#print(A)
mx=max(A)
dp=[0 for i in range(mx+1)]
dp[0]=1
dp[1]=1
for i in range(mx-1):
  dp[i+2]=(dp[i]+dp[i+1])%mod
dp[0]=0
dp.append(0)
#print(dp)
ans=1
for i in range(len(A)):
  ans=(ans*dp[A[i]])%mod
print(ans)

Fixed submission:
N,M=map(int,input().split())
mod=10**9+7
dp=[0]*(N+1)
dp[0]=1
dp[-1]=0
A=[]
for i in range(M):
  A.append(int(input()))
A=set(A)
#print(A)
for i in range(1,N+1):
  if dp[i-1]==0 and dp[i-2]==0:
    break
  elif i in A:
    continue
  else:
    dp[i]=(dp[i-1]+dp[i-2])%mod
print(dp[N]%mod)

Buggy python submission (verdict: Runtime Error):
import math
N,M=map(int,input().split())

a1=int(input())
a2=a1
data=[a1]
ans_data=[]
for i in range(M-1):
  a1=a2
  a2=int(input())
  #print("a",a2-a1-1)
  data.append(a2-a1-1)
  
data.append(N-a2-1)
  
data=sorted(data)
#print(data)
if  data[0]==0:
  print(0)
  
elif data[M]==1:
  print(1)
else:
  mm=data.count(1)
  ma=2
  #print("mm=",mm)
  f1=1
  f2=2
  for i in range(0,data[M]+len(data)-2-mm):  
      
    if ma==data[mm]:
      ans_data.append(f2)
      #print("data[mm]",data[mm],"f2",f2,"i",i)
      mm=mm+1
     
    else:
      ma=ma+1
      f11=f1
      f1=f2
      f2=f1+f11
      #print("data[mm]",data[mm],"f2",f2,"ma",ma)
        
        
  ans=1
  #print("ans_data",ans_data)
  for i in range(0,len(ans_data)):
    ans=ans*ans_data[i]
    
  mod=10**9+7
  print(ans%mod)
    
    
    
    

Fixed submission:
N,M=map(int,input().split())
mod=10**9+7
dp=[0]*(N+1)
dp[0]=1
dp[-1]=0
A=[]
for i in range(M):
  A.append(int(input()))
A=set(A)
#print(A)
for i in range(1,N+1):
  if dp[i-1]==0 and dp[i-2]==0:
    break
  elif i in A:
    continue
  else:
    dp[i]=(dp[i-1]+dp[i-2])%mod
print(dp[N]%mod)