Printing string in rows and column pattern Java

Question

i\'m just created a java project to print string that is given in rows and column just like matrix. Here\'s the output that i just made:

h e l l o 
_ w o r l 
d _         


        

Answer 1

When can't go straight turn left to walk, this is the theory used in this solution

int dr[] = {0, 1, 0, -1};
int dc[] = {1, 0, -1, 0};

this is used for always move pattern. And curr & curc represent current position and curm represent current move pattern.

  public int[][] solve(int r, int c, String s) {
    int m[][] = new int[5][5];
    int curr = 0, curc = 0;
    
    for (int pos = 0, curm = 0; pos < r*c; pos++) {
      m[curr][curc] = (int) s.charAt(pos);
      if (curr + dr[curm] < 0 || curr + dr[curm] >= r || curc + dc[curm] < 0 || curc + dc[curm] >= c
          || m[curr + dr[curm]][curc + dc[curm]] != 0)
        curm = (curm + 1) % 4;
      curr = curr + dr[curm];
      curc = curc + dc[curm];
    }
    return m;
  }

Then you can print this way

for (int i = 0; i < r; i++) {
  for (int j = 0; j < c; j++) {
    System.out.printf("%c ", m[i][j]);
  }
  System.out.println("");
}