Forced Particles

All submissions for this problem are available.
Read problems statements in Hindi, Mandarin chinese , Russian and Vietnamese as well.
You are given a grid with $n$ rows and $m$ columns. Each cell of this grid can either be empty or it contains one particle. It can never contain more than one particle. Let's denote the cell in the $i$th row and $j$th column by $(i, j)$, with the top left corner being $(0, 0)$. From a cell $(i, j)$, a particle could move in one of the following four directions:  to the left, i.e. to the cell $(i, j  1)$  to the right, i.e. to the cell $(i, j + 1)$  up, i.e. to the cell $(i  1, j)$  down, i.e. to the cell $(i + 1, j)$ It is not possible for a particle to move to a cell that already contains a particle or to a cell that does not exist (leave the grid). It is possible to *apply a force* in each of these directions. When a force is applied in a given direction, all particles will simultaneously start moving in this direction as long as it is still possible for them to move. You are given a sequence of forces. Each subsequent force is applied only after all particles have stopped moving. Determine which cells of the grid contain particles after all forces from this sequence are applied in the given order. ### Input  The first line of the input contains a single integer $T$ denoting the number of test cases. The description of $T$ test cases follows.  The first line of each test case contains two spaceseparated integers $n$ and $m$.  $n$ lines describing the initial grid follow. For each $i$ ($1 \le i \le n$), the $i$th of these lines contains a binary string with length $m$ describing the $i$th row of the grid. For each $j$ ($1 \le j \le m$), if the $j$th character of this string is '1', then the cell $(i, j)$ contains a particle, and if it is '0', then the cell $(i, j)$ is empty.  The last line contains a single string $S$ describing the sequence of applied forces. Each character of this string corresponds to applying a force in some direction; forces applied in the directions left, right, up, down correspond to characters 'L', 'R', 'U', 'D' respectively. ### Output For each test case, print $n$ lines each containing a binary string of length $m$, describing the resulting grid (after all the forces are applied) in the same format as the input grid. ### Constraints  $1 \le T \le 200$  $1 \le n, m \le 100$  $1 \le S \le 2 \cdot 10^4$ ### Subtasks **Subtaks #1 (30 points):**  $1 \le T \le 10$  $1 \le n, m \le 10$  $1 \le S \le 100$ **Subtask #2 (70 points):** Original constraints ### Example Input ``` 3 4 4 1010 0010 1001 0100 LRDU 4 3 000 010 001 101 LRL 3 2 01 10 00 D ``` ### Example Output ``` 0011 0011 0001 0001 000 100 100 110 00 00 11 ``` ### Explanation **Example case 1:** The initial grid is: ``` 1010 0010 1001 0100 ``` After applying the first force (in the direction "L", i.e. to the left), the grid is: ``` 1100 1000 1100 1000 ``` After applying the second force (in the direction "R"), the grid is: ``` 0011 0001 0011 0001 ``` After applying the third force (in the direction "D"), the grid is: ``` 0001 0001 0011 0011 ``` After applying the fourth force (in the direction "U"), the final grid is: ``` 0011 0011 0001 0001 ```Author:  fekete 
Editorial  https://discuss.codechef.com/problems/FRCPRT 
Tags  easymedium, fekete, fekete, likecs, ltime62, observations 
Date Added:  25072018 
Time Limit:  0.5 sec 
Source Limit:  50000 Bytes 
Languages:  C, CPP14, JAVA, PYTH, PYTH 3.6, PYPY, CS2, PAS fpc, PAS gpc, RUBY, PHP, GO, NODEJS, HASK, rust, SCALA, swift, D, PERL, FORT, WSPC, ADA, CAML, ICK, BF, ASM, CLPS, PRLG, ICON, SCM qobi, PIKE, ST, NICE, LUA, BASH, NEM, LISP sbcl, LISP clisp, SCM guile, JS, ERL, TCL, kotlin, PERL6, TEXT, SCM chicken, CLOJ, COB, FS 
Comments
 Please login at the top to post a comment.
SUCCESSFUL SUBMISSIONS
Fetching successful submissions