10/25 Homework: Arrays and Lists

Finish the coding problem we started in class

Here is the code we started in Python:

Taking input:

board = []

line = input().split(", ")

i = 0

for i in range(0,4):

board.append([])

while len(line[i])<4:

line[i] = "0"+line[i]

for j in line[i]:

board[i].append(int(j))

Moving the walker once:

copy = [row[:] for row in board] #this creates a copy of the list board

coords = input().split(", ")

r = int(coords[0])-1

c = int(coords[1])-1

if copy[r][c]==0:

copy[r][c] = (copy[r][c]+1)%4

c = (c+1)%4

elif copy[r][c]==1:

copy[r][c] = (copy[r][c]+1)%4

if c==0:

c = 3

else:

c-=1

elif copy[r][c]==2:

copy[r][c] = (copy[r][c]+1)%4

if r==0:

r = 3

else:

r-=1

elif copy[r][c]==3:

copy[r][c] = (copy[r][c]+1)%4

r = (r+1)%4

Here is the code we started in Java:

Taking input:

Scanner in = new Scanner(System.in);

int[][] board = new int[4][4];

String[] line = in.nextLine().split(", ");

for(int i=0; i<4; i++){

while(line[i].length()<4){

line[i] = "0" + line[i];

}

for(int j=0; j<4; j++){

board[i][j] = line[i].charAt(j)-'0';

}

}

Moving the walker once:

int[][] copy = new int[4][];

for(int j=0; j<4; j++){

copy[j] = board[j].clone(); #this creates a copy of the array board

}

String[] coords = in.nextLine().split(", ");

int r = Integer.parseInt(coords[0])-1;

int c = Integer.parseInt(coords[1])-1;

for(int j=0; j<6; j++){

if(copy[r][c]==0){

copy[r][c] = (copy[r][c]+1)%4;

c = (c+1)%4;

}

else if(copy[r][c]==1){

copy[r][c] = (copy[r][c]+1)%4;

if(c==0) c = 3;

else c--;

}

else if(copy[r][c]==2){

copy[r][c] = (copy[r][c]+1)%4;

if(r==0) r = 3;

else r--;

}

else if(copy[r][c]==3){

copy[r][c] = (copy[r][c]+1)%4;

r = (r+1)%4;

}