Garden

2000ms

262144K

Description:

Vasya has a very beautiful country garden that can be represented as an n × m rectangular field divided into n·m squares. One beautiful day Vasya remembered that he needs to pave roads between k important squares that contain buildings. To pave a road, he can cover some squares of his garden with concrete.

For each garden square we know number a_i_j that represents the number of flowers that grow in the square with coordinates (i, j). When a square is covered with concrete, all flowers that grow in the square die.

Vasya wants to cover some squares with concrete so that the following conditions were fulfilled:

all k important squares should necessarily be covered with concrete
from each important square there should be a way to any other important square. The way should go be paved with concrete-covered squares considering that neighboring squares are squares that have a common side
the total number of dead plants should be minimum

As Vasya has a rather large garden, he asks you to help him.

Input:

The first input line contains three integers n, m and k (1 ≤ n, m ≤ 100, n·m ≤ 200, 1 ≤ k ≤ min(n·m, 7)) — the garden's sizes and the number of the important squares. Each of the next n lines contains m numbers a_i_j (1 ≤ a_i_j ≤ 1000) — the numbers of flowers in the squares. Next k lines contain coordinates of important squares written as "x y" (without quotes) (1 ≤ x ≤ n, 1 ≤ y ≤ m). The numbers written on one line are separated by spaces. It is guaranteed that all k important squares have different coordinates.

Output:

In the first line print the single integer — the minimum number of plants that die during the road construction. Then print n lines each containing m characters — the garden's plan. In this plan use character "X" (uppercase Latin letter X) to represent a concrete-covered square and use character "." (dot) for a square that isn't covered with concrete. If there are multiple solutions, print any of them.

Sample Input:

Sample Output:

9
.X.
.X.
.XX

Sample Input:

Sample Output:

26
X..XX
XXXX.
X.X..
X.XX.

Informação

Provedor Codeforces

Código CF152E