Buggy python submission (verdict: Runtime Error):
from itertools import product

def mat2_mul(X, Y):
	z = [[0, 0], [0, 0]]
	for (i, j, k) in product(range(2), range(2), range(2)):
		z[i][j] += X[i][k] * Y[k][j]
	return z

def mat2_pow(X, n):
	if n == 0:
		return [[1, 0], [0, 1]]
	elif n % 2:
		return mat2_mul(X, mat2_pow(X, n - 1))
	else:
		half_pow = mat2_pow(X, n / 2)
		return mat2_mul(half_pow, half_pow)

def fib(n):
	if n == 0:
		return 0
	else:
		f = [[0, 1], [1, 1]]
	return mat2_pow(f, n - 1)[1][1]

def main():
    n, m = map(int,input().split())
    mlis = []
    for _ in range(m):
        a = int(input())
        mlis.append(a)
    ans = 1
    mae = 0

   infi = 10 **9 + 7
   for num in mlis:
       ans *= fibona(num-mae)
       ans %= infi
       mae = num + 1

    nobori = n - mae + 1
    ans *= fibona(nobori) 
    ans %= infi
    print(int(ans))
    



if __name__ == "__main__":
    main()

Fixed submission:
from itertools import product

def mat2_mul(X, Y):
	z = [[0, 0], [0, 0]]
	for (i, j, k) in product(range(2), range(2), range(2)):
		z[i][j] += X[i][k] * Y[k][j]
	return z

def mat2_pow(X, n):
	if n == 0:
		return [[1, 0], [0, 1]]
	elif n % 2:
		return mat2_mul(X, mat2_pow(X, n - 1))
	else:
		half_pow = mat2_pow(X, n / 2)
		return mat2_mul(half_pow, half_pow)

def fibona(n):
	if n == 0:
		return 0
	else:
		f = [[0, 1], [1, 1]]
	return mat2_pow(f, n - 1)[1][1]

def main():
    n, m = map(int,input().split())
    mlis = []
    for _ in range(m):
        a = int(input())
        mlis.append(a)
    ans = 1
    mae = 0

    infi = 10 ** 9 + 7
    for num in mlis:
        ans *= fibona(num-mae)
        ans %= infi
        mae = num + 1

    nobori = n - mae + 1
    ans *= fibona(nobori) 
    ans %= infi
    print(int(ans))
    



if __name__ == "__main__":
    main()

Buggy python submission (verdict: Runtime Error):
def fibona(x):
    import math
    from decimal import Decimal
    return Decimal(((1/2+math.sqrt(5)/2)**(x+1))-((1/2-math.sqrt(5)/2)**(x+1))) // Decimal(math.sqrt(5))

def main():
    n, m = map(int,input().split())
    mlis = []
    for _ in range(m):
        a = int(input())
        mlis.append(a)
    ans = 1
    mae = -1

    for i in range(m):

        broken = mlis[i]
        if mae == broken - 1:
            print(0)
            exit()

        nobori = (broken-1) - (mae+1)
        if nobori == 0:
            ans *= 1
            mae = broken
        else:
            ans *= fibona(nobori)
            ans %= (10 ** 9 + 7)
            mae = broken

    nobori = n - (mae+1)
    ans *= fibona(nobori) 
    ans %= (10 ** 9 + 7)
    print(int(ans))



if __name__ == "__main__":
    main()

Fixed submission:
from itertools import product

def mat2_mul(X, Y):
	z = [[0, 0], [0, 0]]
	for (i, j, k) in product(range(2), range(2), range(2)):
		z[i][j] += X[i][k] * Y[k][j]
	return z

def mat2_pow(X, n):
	if n == 0:
		return [[1, 0], [0, 1]]
	elif n % 2:
		return mat2_mul(X, mat2_pow(X, n - 1))
	else:
		half_pow = mat2_pow(X, n / 2)
		return mat2_mul(half_pow, half_pow)

def fibona(n):
	if n == 0:
		return 0
	else:
		f = [[0, 1], [1, 1]]
	return mat2_pow(f, n - 1)[1][1]

def main():
    n, m = map(int,input().split())
    mlis = []
    for _ in range(m):
        a = int(input())
        mlis.append(a)
    ans = 1
    mae = 0

    infi = 10 ** 9 + 7
    for num in mlis:
        ans *= fibona(num-mae)
        ans %= infi
        mae = num + 1

    nobori = n - mae + 1
    ans *= fibona(nobori) 
    ans %= infi
    print(int(ans))
    



if __name__ == "__main__":
    main()

Buggy python submission (verdict: Runtime Error):
def fibona(x):
    import math
    return (((1/2+math.sqrt(5)/2)**(x+1))-((1/2-math.sqrt(5)/2)**(x+1))) // math.sqrt(5)

def main():
    n, m = map(int,input().split())
    mlis = []
    for _ in range(m):
        a = int(input())
        mlis.append(a)
    ans = 1
    mae = -1

    for i in range(m):
        broken = mlis[i]
        if mae == broken - 1:
            print(0)
            exit()
        nobori = (broken-1) - (mae+1)
        if nobori == 0:
            ans *= 1
            mae = broken
        else:
            ans *= fibona(nobori)
            ans = int(ans)
            ans %= (10 ** 9 + 7)
            mae = broken
    nobori = n - (mae+1)
    ans *= fibona(nobori) 
    ans = int(ans)
    ans %= (10 ** 9 + 7)
    print(ans)

        
        



if __name__ == "__main__":
    main()


Fixed submission:
from itertools import product

def mat2_mul(X, Y):
	z = [[0, 0], [0, 0]]
	for (i, j, k) in product(range(2), range(2), range(2)):
		z[i][j] += X[i][k] * Y[k][j]
	return z

def mat2_pow(X, n):
	if n == 0:
		return [[1, 0], [0, 1]]
	elif n % 2:
		return mat2_mul(X, mat2_pow(X, n - 1))
	else:
		half_pow = mat2_pow(X, n / 2)
		return mat2_mul(half_pow, half_pow)

def fibona(n):
	if n == 0:
		return 0
	else:
		f = [[0, 1], [1, 1]]
	return mat2_pow(f, n - 1)[1][1]

def main():
    n, m = map(int,input().split())
    mlis = []
    for _ in range(m):
        a = int(input())
        mlis.append(a)
    ans = 1
    mae = 0

    infi = 10 ** 9 + 7
    for num in mlis:
        ans *= fibona(num-mae)
        ans %= infi
        mae = num + 1

    nobori = n - mae + 1
    ans *= fibona(nobori) 
    ans %= infi
    print(int(ans))
    



if __name__ == "__main__":
    main()

Buggy python submission (verdict: Runtime Error):
def fibona(x):
    import math
    return (((1/2+math.sqrt(5)/2)**(x+1))-((1/2-math.sqrt(5)/2)**(x+1)))//math.sqrt(5)

def main():
    n, m = map(int,input().split())
    mlis = []
    for _ in range(m):
        a = int(input())
        mlis.append(a)
    ans = 1
    mae = -1

    for i in range(m):
        broken = mlis[i]
        if mae == broken - 1:
            print(0)
            exit()
        nobori = broken - 1 - (mae + 1)
        if nobori == 0:
            ans *= 1
            mae = broken
        else:
            ans *= fibona(nobori)
            ans %= (10 ** 9 + 7)
            #print(i, broken, nobori, ans) 
            mae = broken
    nobori = n - (mae+1)
    ans *= fibona(nobori) 
    ans %= (10 ** 9 + 7)
    print(int(ans))

        
        



if __name__ == "__main__":
    main()


Fixed submission:
from itertools import product

def mat2_mul(X, Y):
	z = [[0, 0], [0, 0]]
	for (i, j, k) in product(range(2), range(2), range(2)):
		z[i][j] += X[i][k] * Y[k][j]
	return z

def mat2_pow(X, n):
	if n == 0:
		return [[1, 0], [0, 1]]
	elif n % 2:
		return mat2_mul(X, mat2_pow(X, n - 1))
	else:
		half_pow = mat2_pow(X, n / 2)
		return mat2_mul(half_pow, half_pow)

def fibona(n):
	if n == 0:
		return 0
	else:
		f = [[0, 1], [1, 1]]
	return mat2_pow(f, n - 1)[1][1]

def main():
    n, m = map(int,input().split())
    mlis = []
    for _ in range(m):
        a = int(input())
        mlis.append(a)
    ans = 1
    mae = 0

    infi = 10 ** 9 + 7
    for num in mlis:
        ans *= fibona(num-mae)
        ans %= infi
        mae = num + 1

    nobori = n - mae + 1
    ans *= fibona(nobori) 
    ans %= infi
    print(int(ans))
    



if __name__ == "__main__":
    main()

Buggy python submission (verdict: Runtime Error):
def fibona(x):
    import math
    return (((1/2+math.sqrt(5)/2)**(x+1))-((1/2-math.sqrt(5)/2)**(x+1)))//math.sqrt(5)

def main():
    n, m = map(int,input().split())
    mlis = []
    for _ in range(m):
        a = int(input())
        mlis.append(a)
    ans = 1
    mae = -1

    for i in range(m):
        broken = mlis[i]
        if mae == broken - 1:
            print(0)
            exit()
        nobori = broken - 1 - (mae + 1)
        if nobori == 0:
            ans *= 1
            mae = broken
        else:
            ans *= fibona(nobori)
            ans %= (10 ** 9 + 7)
            #print(i, broken, nobori, ans) 
            mae = broken
    nobori = n - (mae+1)
    ans *= fibona(nobori) 
    ans %= (10 ** 9 + 7)
    print(ans)

        
        



if __name__ == "__main__":
    main()


Fixed submission:
from itertools import product

def mat2_mul(X, Y):
	z = [[0, 0], [0, 0]]
	for (i, j, k) in product(range(2), range(2), range(2)):
		z[i][j] += X[i][k] * Y[k][j]
	return z

def mat2_pow(X, n):
	if n == 0:
		return [[1, 0], [0, 1]]
	elif n % 2:
		return mat2_mul(X, mat2_pow(X, n - 1))
	else:
		half_pow = mat2_pow(X, n / 2)
		return mat2_mul(half_pow, half_pow)

def fibona(n):
	if n == 0:
		return 0
	else:
		f = [[0, 1], [1, 1]]
	return mat2_pow(f, n - 1)[1][1]

def main():
    n, m = map(int,input().split())
    mlis = []
    for _ in range(m):
        a = int(input())
        mlis.append(a)
    ans = 1
    mae = 0

    infi = 10 ** 9 + 7
    for num in mlis:
        ans *= fibona(num-mae)
        ans %= infi
        mae = num + 1

    nobori = n - mae + 1
    ans *= fibona(nobori) 
    ans %= infi
    print(int(ans))
    



if __name__ == "__main__":
    main()