LeetCode54

src/main/java/cn/whaifree/leetCode/middle/LeetCode54.java

@@ -0,0 +1,86 @@
+package cn.whaifree.leetCode.middle;
+
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * 给你一个 m 行 n 列的矩阵 matrix ，请按照 顺时针螺旋顺序 ，返回矩阵中的所有元素。
+ */
+public class LeetCode54 {
+
+    public List<Integer> spiralOrder(int[][] matrix) {
+        int width = matrix[0].length;
+        int height = matrix.length;
+        List<Integer> s = new ArrayList<>(width * height);
+
+        if (width == 1) {
+
+        } else if (height == 1) {
+
+        }
+
+        int loop = Math.min(width, height) / 2;
+        int start = 0;
+        int i = 0, j = 0;
+        while (start < loop) {
+
+            for (i = start; i < width - start - 1; i++) {
+                s.add(matrix[start][i]);
+            }
+
+            for (j = start; j < height - start - 1; j++) {
+                s.add(matrix[j][i]);
+            }
+
+            for (; i >= start + 1; i--) {
+                s.add(matrix[j][i]);
+            }
+
+            for (; j >= start + 1; j--) {
+                s.add(matrix[j][i]);
+            }
+            start++;
+        }
+
+        if (width > height) {
+            if (height == 1) {
+                // 横向填充
+                for (; i < width - start; i++) {
+                    s.add(matrix[start][i]);
+                }
+            }else if (height % 2 == 1) {
+                // 横向填充
+                for (; i < width - start-1; i++) {
+                    s.add(matrix[start][i + 1]);
+                }
+            }
+
+        } else {
+            // 纵向填充
+            if (width == 1) {
+                for (; j < height - start; j++) {
+                    s.add(matrix[j][i]);
+                }
+            } else if (width % 2 == 1 ) {
+                for (; j < height - start - 1; j++) {
+                    s.add(matrix[j+1][i + 1]);
+                }
+            }
+        }
+
+        return s;
+
+    }
+
+    @Test
+    public void test() {
+        spiralOrder(new int[][]{
+                {1,2,4},
+                {5,6,8},
+                {9,10,12}
+
+        }).forEach(System.out::println);
+    }
+}