Problem: There is a staircase with N steps. Takahashi is now standing at the foot of the stairs, that is, on the 0-th step. He can climb up one or two steps at a time.  However, the treads of the a_1-th, a_2-th, a_3-th, \ldots, a_M-th steps are broken, so it is dangerous to set foot on those steps.  How many are there to climb up to the top step, that is, the N-th step, without setting foot on the broken steps? Find the count modulo 1\ 000\ 000\ 007.

Submission attempts (in order):
try:
    a = list(map(int, input().split()))
    #print(a)
    b=[0]*a[1]
    c=[0]*(a[1]+1)
    b[0]=int(input())
    c[0]=b[0]-0
    for x in range(a[1]-1):
        b[x+1]=int(input())
        c[x+1]=b[x+1]-b[x]-1
    c[-1]=a[0]-b[-1]
    max = 0
    min = a[0]+100
    for x in c:
        if x>max:
            max=x
        if x<min:
            min=x
        
    #print(c)
    #print(max," ",min)
    if min==0:
        print(0)
    else:
        num=[0]*(max)
        for x in range(max):
            if x==0:
                num[0]=1
            elif x==1:
                num[1]=1
            else:
                num[x]=num[x-1]+num[x-2]
            #print("num[",x,"]=",num[x])
        
        answer=1
    
        for x in c:
            answer *=num[x-1]
            if answer==0:
                print(0)
                break
            else:
                answer%=1000000007
        print(answer)
    except:
        print(0)

n,m = list(map(int, input().split()))
a=[]
a.append(-1)
for x in range(m):
  tmp=int(input())
  a.append(tmp)
a.append(n+1)
diff = []
for x in range(len(a)-1):
  diff.append(a[x+1]-a[x])
              
large = 0
small = 123456789012345
for x in diff:
  large=max(large,x)
  small=min(small,x)

num=[0,0,1]
for _ in range(large):
  num.append((num[-1]+num[-2])%1000000007)
    
answer=1
for x in diff:
  #print(x,num[x])
  answer *=num[x]
  answer%=1000000007
print("AN=",answer)

a = list(map(int, input().split()))
#print(a)
b=[0]*1234567
c=[0]*1234567
b[0]=int(input())
c[0]=b[0]-0
for x in range(a[1]-1):
    b[x+1]=int(input())
    c[x+1]=b[x+1]-b[x]-1
c[-1]=a[0]-b[-1]
max = 0
min = a[0]+10000
for x in c:
    if x>max:
        max=x
    if x<min:
        min=x
        
#print(c)
#print(max," ",min)
if min==0:
    print(0)
else:
    num=[0]*1234567
    for x in range(max):
        if x==0:
            num[0]=1
        elif x==1:
            num[1]=1
        else:
            num[x]=num[x-1]+num[x-2]
        #print("num[",x,"]=",num[x])
        
    answer=1
    for x in c:
        answer *=num[x-1]
        if answer==0:
            print(0)
            break
        else:
            answer%=1000000007
    print(answer)


a = list(map(int, input().split()))
#print(a)
b=[0]*(a[1]+5000)
c=[0]*(a[1]+1+5000)
b[0]=int(input())
c[0]=b[0]-0
for x in range(a[1]-1):
    b[x+1]=int(input())
    c[x+1]=b[x+1]-b[x]-1
c[-1]=a[0]-b[-1]
max = 0
min = a[0]+100
for x in c:
    if x>max:
        max=x
    if x<min:
        min=x
        
#print(c)
#print(max," ",min)
if min==0:
    print(0)
else:
    num=[0]*(max+5000)
    for x in range(max):
        if x==0:
            num[0]=1
        elif x==1:
            num[1]=1
        else:
            num[x]=num[x-1]+num[x-2]
        #print("num[",x,"]=",num[x])
        
    answer=1
    for x in c:
        answer *=num[x-1]
        if answer==0:
            print(0)
            break
        else:
            answer%=1000000007
    print(answer)


a = list(map(int, input().split()))
#print(a)
b=[0]*a[1]
c=[0]*(a[1]+1)
b[0]=int(input())
c[0]=b[0]-0
for x in range(a[1]-1):
    b[x+1]=int(input())
    c[x+1]=b[x+1]-b[x]-1
c[-1]=a[0]-b[-1]
try:
	max = 0
	min = a[0]+100
	for x in c:
	    if x>max:
	        max=x
	    if x<min:
	        min=x
	        
	#print(c)
#pr	int(max," ",min)
	if min==0:
   		print(0)
	else:
    	num=[0]*(max)
  		for x in range(max):
        	if x==0:
            	num[0]=1
        	elif x==1:
            	num[1]=1
        	else:
            	num[x]=num[x-1]+num[x-2]
        #print("num[",x,"]=",num[x])
        
    	answer=1
    	for x in c:
        	answer *=num[x-1]
        	answer%=1000000007
    	print(answer)
except:
	print(0)

n,m = list(map(int, input().split()))
a=[]
a.append(-1)
for x in range(m):
  tmp=int(input())
  a.append(tmp)
a.append(n+1)
diff = []
for x in range(len(a)-1):
  diff.append(a[x+1]-a[x])
              
large = 0
small = 123456789012345
for x in diff:
  large=max(large,x)
  small=min(small,x)

num=[0,0,1]
for _ in range(large):
  num.append((num[-1]+num[-2])%1000000007)
    
answer=1
for x in diff:
  #print(x,num[x])
  answer *=num[x]
  answer%=1000000007
print(answer)

Verdicts: Runtime Error

Wrong Answer

Runtime Error

Runtime Error

Runtime Error

Accepted