MAPEXC - Map Exploration Cost
Duck is a young boy who likes to explore the world. Recently, he found an underground place on the Internet and plans to visit. But it is not an easy task because he will have to excavate a tunnel which is a very physical work. Whenever Duck moves one unit, his energy is reduced by one unit, so the exploration cost is increased by one. Luckily, there may be exactly one (or no) existing tunnel or underground space, in this case, Duck can move inside that region without excavating, hence no exploration cost is increased.
You are give an underground map, which is represented as a matrix of N rows and M columns. The matrix consisting of '#' (Rock, visit to there requiring excavation and increase 1 cost), '.' (existing tunnel or space, move between them without increasing cost), 'S' (Starting point), and 'F' (Destination). For example, from # to # / # to . / . to # / S to . / S to # / . to F / # to F / S to F will increase 1 unit of cost, only from . to . will increase no cost.
Given the maximum cost D, You task is divided into two parts: 1. Check whether it is possible to reach F from S without spending more than D cost. 2. Output the new map, keep showing 'S' and 'F', and the cells that can be visited within the minimum cost required to reach F (inclusive) are represented by '.', otherwises '#'. Because Duck is not allowed to pass through F, in some cases, it is impossible to get to some cells. Those cells will be represented by '#' as well. Initially, the exploration cost at S is 0, and Duck can only move in four directions (Up, Down, Left, Right), no diagonal move is allowed.
Input
The first line is the number of test cases T. (1 ≤ T ≤ 40)
For each test case, it starts with three integers N (Number of rows), M (Number of columns), D (Maximum cost Duck can spend). (1 ≤ N, M ≤ 200, 0 ≤ D ≤ M + N)
The following N lines, each line consisting of M characters, either S, F, # or . , representing the map.
It is guaranteed that no two separated tunnels allowed (at most one, all '.' cells are connected with at least one adjacent edge, or no '.' exists at all), and N and M will not both equal 1.
Output
For each test case, in the first line, output the word POSSIBLE or IMPOSSIBLE indicating if it is possible to reach F from S within D cost (inclusive).
Then, output N lines containing M characters (S, F, #, .) representing the new map, indicating which cells can be visited without exceeding the minimum cost required to reach F, which not necessarily equal D.
Print a blank line after each test case.
Example
Input: 3 8 8 8 ######## #####S## #.###### #...#..# ###...## #####.## ######## #####F## 1 10 6 S####.F### 6 9 4 ######### #S###...# #######.# ##....... ######### ######F## Output: POSSIBLE #....... .....S.. ........ ........ ........ #....... ###....# #####F## POSSIBLE S.....F### IMPOSSIBLE ......... .S....... ......... ......... ......... ......F..
Explanation
In case 1, the cost matrix is:
54432123
43321012
32332123
32223223
43322234
54433234
65544345
76655456
We can see that the minimum cost required to reach F from S is 4, which is less than 8, so output POSSIBLE.
For the new map, we keep the S and F, and those cells with minimum cost less than or equal to 4 is represented by '.', otherwise '#'.
In case 2, the cost matrix is 0123456-1-1-1, because we cannot pass through F, but it is impossible to reach the three most right cells without passing through F, so the minimum cost for those cells are both -1.
In case 3, the cost matrix is:
212344445
101233334
212344434
323333333
434444444
545555555
The answer is impossible because the minimum cost at F is 5 which is more than 4.
However, no cell has minimum cost more than 5, so they are all represented by '.', except S and F.
hide comments
[Lakshman]:
2023-12-17 22:14:18
@him0727 does input have spaces between them, as shown in the example?
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Arianto Wibowo:
2023-11-21 20:01:10
@Sushovan Sen
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Sushovan Sen:
2022-09-23 14:05:33
What is expected output for
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nadstratosfer:
2018-03-30 07:05:08
The cost required to reach cell (0,2) in first example is 4.
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Added by: | him0727 |
Date: | 2018-03-29 |
Time limit: | 0.600s |
Source limit: | 50000B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Languages: | All |
Resource: | Own problem |