2022-06-30 update: added "Spiral Matrix"

Author: fartem

src/main/java/com/smlnskgmail/jaman/leetcodejava/medium/SpiralMatrix.java

@@ -0,0 +1,49 @@
+package com.smlnskgmail.jaman.leetcodejava.medium;
+
+import java.util.ArrayList;
+import java.util.List;
+
+// https://leetcode.com/problems/spiral-matrix/
+public class SpiralMatrix {
+
+    private final int[][] input;
+
+    public SpiralMatrix(int[][] input) {
+        this.input = input;
+    }
+
+    public List<Integer> solution() {
+        int top = 0;
+        int bottom = input.length - 1;
+        int left = 0;
+        int right = input[0].length - 1;
+        List<Integer> result = new ArrayList<>();
+        while (top <= bottom && left <= right) {
+            for (int i = left; i <= right; i++) {
+                result.add(input[top][i]);
+            }
+            top++;
+
+            for (int i = top; i <= bottom; i++) {
+                result.add(input[i][right]);
+            }
+            right--;
+
+            if (top <= bottom) {
+                for (int i = right; i >= left; i--) {
+                    result.add(input[bottom][i]);
+                }
+                bottom--;
+            }
+
+            if (left <= right) {
+                for (int i = bottom; i >= top; i--) {
+                    result.add(input[i][left]);
+                }
+                left++;
+            }
+        }
+        return result;
+    }
+
+}

src/test/java/com/smlnskgmail/jaman/leetcodejava/medium/SpiralMatrixTest.java

@@ -0,0 +1,19 @@
+package com.smlnskgmail.jaman.leetcodejava.medium;
+
+import org.junit.Test;
+
+import java.util.List;
+
+import static org.junit.Assert.assertEquals;
+
+public class SpiralMatrixTest {
+
+    @Test
+    public void defaultTest() {
+        assertEquals(
+                List.of(1, 2, 3, 6, 9, 8, 7, 4, 5),
+                new SpiralMatrix(new int[][]{{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}).solution()
+        );
+    }
+
+}