Problem:
Score : 500 points

Problem Statement

We have N logs of lengths A_1,A_2,\cdots A_N.

We can cut these logs at most K times in total. When a log of length L is cut at a point whose distance from an end of the log is t (0<t<L), it becomes two logs of lengths t and L-t.

Find the shortest possible length of the longest log after at most K cuts, and print it after rounding up to an integer.

Constraints

1 \leq N \leq 2 \times 10^5

0 \leq K \leq 10^9

1 \leq A_i \leq 10^9

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N K
A_1 A_2 \cdots A_N

Output

Print an integer representing the answer.

Sample Input 1

2 3
7 9

Sample Output 1

4

First, we will cut the log of length 7 at a point whose distance from an end of the log is 3.5, resulting in two logs of length 3.5 each.

Next, we will cut the log of length 9 at a point whose distance from an end of the log is 3, resulting in two logs of length 3 and 6.

Lastly, we will cut the log of length 6 at a point whose distance from an end of the log is 3.3, resulting in two logs of length 3.3 and 2.7.

In this case, the longest length of a log will be 3.5, which is the shortest possible result. After rounding up to an integer, the output should be 4.

Sample Input 2

3 0
3 4 5

Sample Output 2

5

Sample Input 3

10 10
158260522 877914575 602436426 24979445 861648772 623690081 433933447 476190629 262703497 211047202

Sample Output 3

292638192

Solution in Python (3.8.2) (judge verdict: Wrong Answer)

#!/usr/bin/env python3
from math import ceil
# from numba import njit
# input = stdin.readline


# k回以内にすべての長さをl以下にできるか
def isDividable(l,k,a):
  cnt = 0
  for L in a:
    cnt += ceil(L // l)
  return cnt <= k


#bottom = ng,top = ok
def binary_search(ng,ok,k,a):
  while abs(ng-ok) > 1:
    mid = (ng + ok) // 2
    if isDividable(mid,k,a):
      ok = mid
    else:
      ng = mid
  return ok


# @njit
def solve(k,a):
  return binary_search(0,max(a),k,a)



def main():
  N,K = map(int,input().split())
  a = list(map(int,input().split()))
  print(solve(K,a))
  return

if __name__ == '__main__':
  main()