I am trying to solve this Problem.

I have a Python code and I need to fill in this one gap

# A an integer array for city centers

# k an integer number of shops

# return an integer

def groceryShops(A, k):

if not A:

return 0

```
n = len(A) # n is the number of city centers.
if k >= n: # we should not have more shops than city centers.
return 0
A.sort()
cost = [[0 for _ in range(n + 1)] for _ in range(n + 1)]
"""
cost[i][j] is the minimum cost to build a shop between city centers i and j
This shop should be in the median of the city centers.
"""
for i in range(n):
for j in range(i, n):
mid = int(i + (j - i) / 2)
print("i= ", i, " j= ", j, "Median is: ", mid, " Center:", A[mid], "\n")
for r in range(i, mid + 1):
cost[i + 1][j + 1] += A[mid] - A[r]
print("dist of ", A[mid] ," --to-> " , A[r], " Right ", cost[i + 1][j + 1])
for r in range(mid + 1, j + 1):
cost[i + 1][j + 1] += A[r] - A[mid]
print("dist of ", A[mid] ," <--to-- " , A[r], " Left ", cost[i + 1][j + 1])
print("COST: ", "(", A[i ], "," ,A[j], " )", cost[i + 1][j + 1], "\n\n")
# print("cost")
# for row in cost:
# for c in row:
# print(c, end = " ")
# print()
"""
dp[i][j] is the minimum cost for the first j city centers with i shops.
"""
dp = [[float('inf') for _ in range(n + 1)] for _ in range(k + 1)]
dp[0][0] = 0
for i in range(1, k + 1):
for j in range(1, n + 1):
for r in range(j):
dp[i][j] = ?? # only fill this gap :), min or max of some values using i, j and r?
# print("\n\nDP Table")
# for row in dp:
# for c in row:
# print(c, end = " ")
# print("\n")
return dp[-1][-1]
```

Any help would be greatly appreciated