## Tuesday, 25 August 2015

### Spiral Matrix in Java

Given a matrix of m x n elements (m rows, n columns), return all elements of the matrix in spiral order.
package core.geeks;

public class SpriralMatrix {
public static void main(String[] args) {
int[][] array = {  {0, 1, 2, 3, 4},
{5, 6, 7, 8, 9},
{10, 11, 12, 13, 14},
{15, 16, 17, 18, 19}};
printSpiral(array);
}

private static void printSpiral(int[][] array) {
int left=0; int right = array[0].length-1;
int top = 0; int bottom = array.length-1;
int count = 0;

while(right>=left && top <= bottom) {

if(count==0) {
// print top row
for(int i = left;i<=right;i++) {
System.out.print(" "+array[top][i]);
}
top++;
} else if(count==1) {

// print right most column
for(int i = top;i<=bottom;i++) {
System.out.print(" "+array[i][right]);
}
right--;

} else if(count==2) {
// print bottom row in reverse order.
for(int i = right;i>=left;i--) {
System.out.print(" "+array[bottom][i]);
}
bottom--;
} else if(count==3) {
// print right most column
for(int i = bottom;i>=top;i--) {
System.out.print(" "+array[i][left]);
}
left ++;
}
count = (count+1)%4;
}
}
}

Output:
0 1 2 3 4 9 14 19 18 17 16 15 10 5 6 7 8 13 12 11