Buggy python submission (verdict: Runtime Error):
#from functools import lru_cache
import sys
import math
def vfunc(f): return lambda *lst, **kwargs: list(map(lambda *x:f(*x,**kwargs),*lst))

def rvfunc(f): return lambda *lst, **kwargs: list(map(lambda *x:rvfunc(f)(*x,**kwargs) if all(vfunc(lambda y:isinstance(y,list))(x)) else f(*x,**kwargs),*lst))

def reader():return vfunc(lambda l:l.split())(sys.stdin.readlines())

ls = rvfunc(int)(reader())
n,k=ls[0]
a=ls[1]

def reqk(num):
    return sum(vfunc(lambda aa:math.ceil(aa/float(num))-1)(a))
def binary_search(imin=None,imax=None):
    if [imin,imax]==[None]*2: imin,imax=0,10**9
    if (imax < imin):
        return imin
    else:
        imid = int(imin + (imax - imin) / 2)
        if (reqk(imid)<k):return binary_search(imin, imid - 1)
        elif (reqk(imid)>k):return binary_search(imid + 1, imax)
        else:return imid
print(binary_search() if k!=0 else max(a))


Fixed submission:
#from functools import lru_cache
import sys
from itertools import product
from itertools import combinations
from functools import reduce

def vfunc(f): return lambda *lst, **kwargs: list(map(lambda *x:f(*x,**kwargs),*lst))

def rvfunc(f): return lambda *lst, **kwargs: list(map(lambda *x:rvfunc(f)(*x,**kwargs) if all(vfunc(lambda y:isinstance(y,list))(x)) else f(*x,**kwargs),*lst))

def reader():return vfunc(lambda l:l.split())(sys.stdin.readlines())

k=int(input())
t=0
m=7%k
md=7%k
for i in range(k+1):
    if m==0:break
    else:
        md=(md*10)%k
        m=(m+md)%k
if i==k: i=-2
print(i+1)

Buggy python submission (verdict: Runtime Error):
#from functools import lru_cache
import sys
import math
def vfunc(f): return lambda *lst, **kwargs: list(map(lambda *x:f(*x,**kwargs),*lst))

def rvfunc(f): return lambda *lst, **kwargs: list(map(lambda *x:rvfunc(f)(*x,**kwargs) if all(vfunc(lambda y:isinstance(y,list))(x)) else f(*x,**kwargs),*lst))

def reader():return vfunc(lambda l:l.split())(sys.stdin.readlines())

ls = rvfunc(int)(reader())
n,k=ls[0]
a=ls[1]

def reqk(num):
    return sum(vfunc(lambda aa:(math.ceil(aa/float(num))-1) if math.ceil(aa/float(num))!= 0 else 0)(a))
def binary_search(imin=None,imax=None):
    if [imin,imax]==[None]*2: imin,imax=0,10**9
    if (imax < imin):
        return imin
    else:
        imid = int(imin + (imax - imin) / 2)
        if (reqk(imid)<k):return binary_search(imin, imid - 1)
        elif (reqk(imid)>k):return binary_search(imid + 1, imax)
        else:return imid
print(binary_search() if k!=0 else max(a))


Fixed submission:
#from functools import lru_cache
import sys
from itertools import product
from itertools import combinations
from functools import reduce

def vfunc(f): return lambda *lst, **kwargs: list(map(lambda *x:f(*x,**kwargs),*lst))

def rvfunc(f): return lambda *lst, **kwargs: list(map(lambda *x:rvfunc(f)(*x,**kwargs) if all(vfunc(lambda y:isinstance(y,list))(x)) else f(*x,**kwargs),*lst))

def reader():return vfunc(lambda l:l.split())(sys.stdin.readlines())

k=int(input())
t=0
m=7%k
md=7%k
for i in range(k+1):
    if m==0:break
    else:
        md=(md*10)%k
        m=(m+md)%k
if i==k: i=-2
print(i+1)

Buggy python submission (verdict: Runtime Error):
#from functools import lru_cache
import sys
import math
def vfunc(f): return lambda *lst, **kwargs: list(map(lambda *x:f(*x,**kwargs),*lst))

def rvfunc(f): return lambda *lst, **kwargs: list(map(lambda *x:rvfunc(f)(*x,**kwargs) if all(vfunc(lambda y:isinstance(y,list))(x)) else f(*x,**kwargs),*lst))

def reader():return vfunc(lambda l:l.split())(sys.stdin.readlines())

ls = rvfunc(int)(reader())
n,k=ls[0]
a=ls[1]

def reqk(num):
    return sum(vfunc(lambda aa:math.ceil(aa/float(num))-1)(a))
def binary_search(imin=None,imax=None):
    if [imin,imax]==[None]*2: imin,imax=0,10**9
    if (imax < imin):
        return imin
    else:
        imid = int(imin + (imax - imin) / 2)
        if (reqk(imid)<k):return binary_search(imin, imid - 1)
        elif (reqk(imid)>k):return binary_search(imid + 1, imax)
        else:return imid
print(binary_search() if k!=0 else max(a))


Fixed submission:
#from functools import lru_cache
import sys
from itertools import product
from itertools import combinations
from functools import reduce

def vfunc(f): return lambda *lst, **kwargs: list(map(lambda *x:f(*x,**kwargs),*lst))

def rvfunc(f): return lambda *lst, **kwargs: list(map(lambda *x:rvfunc(f)(*x,**kwargs) if all(vfunc(lambda y:isinstance(y,list))(x)) else f(*x,**kwargs),*lst))

def reader():return vfunc(lambda l:l.split())(sys.stdin.readlines())

k=int(input())
t=0
m=7%k
md=7%k
for i in range(k+1):
    if m==0:break
    else:
        md=(md*10)%k
        m=(m+md)%k
if i==k: i=-2
print(i+1)