Position and direction on grid

Question

Movement is in the following rules:
1. At a white square on my grid(indicated by a zero),turn 90 degrees right, move forward one square.
2.At a black square on my grid(indicated by a one), turn 90 degrees left, move forward one square

Basically I need to get the new location on my grid after I was on a certain location.
Code needs to accept the colour of the cell I'm currently at, as well as position and direction I am facing and computes the cell's new colour, new position and direction after taking a single step.

INPUT: The first line of input is a single integer, representing the colour of the cell. The next line consists of two integers m and n and a character d, separated by a single space, specifying the row and column location of the ant, and the direction it is facing (either N, S, E, or W for the four cardinal directions).

for example.
Input: 1
3 2 E

Output: 0
2 2 N
https://code.sololearn.com/cyW9P3xVI3Bd/?ref=app

Answer 1

Ok, I'm sorry for all the blunders. I think I finally fixed it. I checked that it gives the same results as the code in the first reply (the one with multiple if/else if, which presumably works but I wanted to "simplify" it - I wish I didn't :D)

https://code.sololearn.com/crVC57xgEnKp

https://code.sololearn.com/cgsHo14VlNMu

Answer 2

if(d == 'N') color ? (--n, d = 'W') : (++n, d = 'E');
else if(d == 'S') color ? (++n, d = 'E') : (--n, d = 'W');
else if(d == 'E') color ? (--m, d = 'N') : (++m, d = 'S');
else if(d == 'W') color ? (++m, d = 'S') : (--m, d = 'N');

Idk where you got the 0 in your output, if it's the opposite of the input color, then do
color = !color;

Answer 3

lion the 0 is an indication that I'm now on a white colour of the cell now after initial position if I move a step

Answer 4

so, it's like a checkerboard.

You know, if you could encode d as an index in "NESW", aka 0 for N, 1 for E etc, you could reduce the code to this:

d = (d+1+c*2) % 4;
m += (d-1)%2;
n -= (d-2)%2;
c = !c;

Like here: https://code.sololearn.com/cSCx0hUEihZ4

Answer 5

SORRY, the previous reply was wrong, I'll work out the problem and come back!

OK, I fixed it now 😇

Answer 6

lion when I run the code it just gives me an output, remember I have to input the initial position on grid(1 or 0 for black or white) on first line and the coordinates on the second line indicating row,column ,direction and then give me an output when I take a step following the movement rules I provided

Answer 7

oh, I initialized the values in the code because I don't like to enter input on Sololearn, and I wanted to spare you that 🙂
But ok, here I made a slightly different version which also asks for input:
https://code.sololearn.com/cvZ9aFfsduCl

Answer 8

lion I'm getting the wrong output

Answer 9

I must have made a mistake again 😮

What was the exact input you gave it?

Answer 10

lion what you have to note is that initially the grid looks like my grid on the code I provided.
Input this on my code and see how the grid initially looks like.

5 5
0 0 0 0 0
1 0 0 1 0
1 1 1 0 0
0 0 0 0 0
0 0 0 0 0

Answer 11

lion the input was : 1
3 2 E

Answer 12

If you use the colors from your grid, why do you also give the color as input? Shouldn't it be taken from the grid, given the coordinates?

Also, grid[3][2] is 0 (not 1 as in your input). Am I to assume the input coordinates are 1-based, and not 0-based like in C/C++? You do display it using 0-based coordinates in your code though.

Here I took the output color from your grid, using 1-based coordinates:
https://code.sololearn.com/crVC57xgEnKp/

(I used a char[][] instead of vector<vector<char>> because it was easier to initialize without reading it as input, but it should work the same with your vector grid)

Answer 13

lion I'm still not getting the desired output I get wrong coordinates

Answer 14

wait, it's still wrong :(

Answer 15

lion run it by yourself and see

Answer 16

lion this what I was looking for.🔥🤝

Answer 17

lion 🐐 🐐 🔥🔥🔥🔥🤝