Data commit

Task/Spiral-matrix/Java/spiral-matrix.java

@@ -0,0 +1,51 @@
+public class Blah {
+
+  public static void main(String[] args) {
+    print2dArray(getSpiralArray(5));
+  }
+
+  public static int[][] getSpiralArray(int dimension) {
+    int[][] spiralArray = new int[dimension][dimension];
+
+    int numConcentricSquares = (int) Math.ceil((dimension) / 2.0);
+
+    int j;
+    int sideLen = dimension;
+    int currNum = 0;
+
+    for (int i = 0; i < numConcentricSquares; i++) {
+      // do top side
+      for (j = 0; j < sideLen; j++) {
+        spiralArray[i][i + j] = currNum++;
+      }
+
+      // do right side
+      for (j = 1; j < sideLen; j++) {
+        spiralArray[i + j][dimension - 1 - i] = currNum++;
+      }
+
+      // do bottom side
+      for (j = sideLen - 2; j > -1; j--) {
+        spiralArray[dimension - 1 - i][i + j] = currNum++;
+      }
+
+      // do left side
+      for (j = sideLen - 2; j > 0; j--) {
+        spiralArray[i + j][i] = currNum++;
+      }
+
+      sideLen -= 2;
+    }
+
+    return spiralArray;
+  }
+
+  public static void print2dArray(int[][] array) {
+    for (int[] row : array) {
+      for (int elem : row) {
+        System.out.printf("%3d", elem);
+      }
+      System.out.println();
+    }
+  }
+}