add q54

.idea/workspace.xml

@@ -2,8 +2,7 @@
 <project version="4">
   <component name="ChangeListManager">
     <list default="true" id="af7ffdf2-4ddc-4ed6-8222-60ed5acbc2ed" name="Default Changelist" comment="">
-      <change afterPath="$PROJECT_DIR$/src/q53/q1/Solution.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/src/q54/Solution.java" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/q53/q2/Solution.java" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
@@ -74,7 +73,7 @@
       <recent name="$PROJECT_DIR$/src/q206/f1" />
     </key>
   </component>
-  <component name="RunManager" selected="Application.Solution (5)">
+  <component name="RunManager" selected="Application.Solution">
     <configuration name="Solution (1)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
       <option name="MAIN_CLASS_NAME" value="q46.f2.Solution" />
       <module name="LeetCode" />
@@ -101,19 +100,6 @@
         <option name="Make" enabled="true" />
       </method>
     </configuration>
-    <configuration name="Solution (3)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
-      <option name="MAIN_CLASS_NAME" value="q21.f1.Solution" />
-      <module name="LeetCode" />
-      <extension name="coverage">
-        <pattern>
-          <option name="PATTERN" value="q21.f1.*" />
-          <option name="ENABLED" value="true" />
-        </pattern>
-      </extension>
-      <method v="2">
-        <option name="Make" enabled="true" />
-      </method>
-    </configuration>
     <configuration name="Solution (4)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
       <option name="MAIN_CLASS_NAME" value="q26.Solution" />
       <module name="LeetCode" />
@@ -141,11 +127,11 @@
       </method>
     </configuration>
     <configuration name="Solution" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
-      <option name="MAIN_CLASS_NAME" value="q53.q1.Solution" />
+      <option name="MAIN_CLASS_NAME" value="q54.Solution" />
       <module name="LeetCode" />
       <extension name="coverage">
         <pattern>
-          <option name="PATTERN" value="q53.q1.*" />
+          <option name="PATTERN" value="q54.*" />
           <option name="ENABLED" value="true" />
         </pattern>
       </extension>
@@ -181,11 +167,11 @@
     </configuration>
     <recent_temporary>
       <list>
+        <item itemvalue="Application.Solution" />
         <item itemvalue="Application.Solution (5)" />
         <item itemvalue="Application.Solution (5)" />
         <item itemvalue="Application.Solution (1)" />
         <item itemvalue="Application.Solution (2)" />
-        <item itemvalue="Application.Solution (4)" />
       </list>
     </recent_temporary>
   </component>
@@ -225,7 +211,7 @@
       <workItem from="1579759214129" duration="10251000" />
       <workItem from="1580044287086" duration="50376000" />
       <workItem from="1580562331089" duration="8289000" />
-      <workItem from="1580626297484" duration="10002000" />
+      <workItem from="1580626297484" duration="13148000" />
     </task>
     <task id="LOCAL-00001" summary="add q5/q7/q172">
       <created>1580045439607</created>
@@ -283,7 +269,14 @@
       <option name="project" value="LOCAL" />
       <updated>1580585083883</updated>
     </task>
-    <option name="localTasksCounter" value="9" />
+    <task id="LOCAL-00009" summary="add q53">
+      <created>1580714190854</created>
+      <option name="number" value="00009" />
+      <option name="presentableId" value="LOCAL-00009" />
+      <option name="project" value="LOCAL" />
+      <updated>1580714190854</updated>
+    </task>
+    <option name="localTasksCounter" value="10" />
     <servers />
   </component>
   <component name="TypeScriptGeneratedFilesManager">
@@ -298,40 +291,41 @@
     <MESSAGE value="add q21" />
     <MESSAGE value="add q26/q43" />
     <MESSAGE value="add q46" />
-    <option name="LAST_COMMIT_MESSAGE" value="add q46" />
+    <MESSAGE value="add q53" />
+    <option name="LAST_COMMIT_MESSAGE" value="add q53" />
   </component>
   <component name="WindowStateProjectService">
     <state x="533" y="166" key="#com.intellij.ide.util.MemberChooser" timestamp="1578548165321">
       <screen x="0" y="0" width="1440" height="900" />
     </state>
     <state x="533" y="166" key="#com.intellij.ide.util.MemberChooser/0.0.1440.900@0.0.1440.900" timestamp="1578548165321" />
-    <state x="303" y="50" key="CommitChangelistDialog2" timestamp="1580585083630">
+    <state x="303" y="50" key="CommitChangelistDialog2" timestamp="1580714190621">
       <screen x="0" y="0" width="1440" height="900" />
     </state>
-    <state x="303" y="50" key="CommitChangelistDialog2/0.0.1440.900@0.0.1440.900" timestamp="1580585083630" />
+    <state x="303" y="50" key="CommitChangelistDialog2/0.0.1440.900@0.0.1440.900" timestamp="1580714190621" />
     <state x="144" y="78" key="DiffContextDialog" timestamp="1580585072145">
       <screen x="0" y="0" width="1440" height="900" />
     </state>
     <state x="144" y="78" key="DiffContextDialog/0.0.1440.900@0.0.1440.900" timestamp="1580585072145" />
-    <state width="1398" height="204" key="GridCell.Tab.0.bottom" timestamp="1580714110161">
+    <state width="1398" height="204" key="GridCell.Tab.0.bottom" timestamp="1580753043493">
       <screen x="0" y="0" width="1440" height="900" />
     </state>
-    <state width="1398" height="204" key="GridCell.Tab.0.bottom/0.0.1440.900@0.0.1440.900" timestamp="1580714110161" />
+    <state width="1398" height="204" key="GridCell.Tab.0.bottom/0.0.1440.900@0.0.1440.900" timestamp="1580753043493" />
     <state width="1398" height="204" key="GridCell.Tab.0.bottom/0.23.1440.797@0.23.1440.797" timestamp="1580706887662" />
-    <state width="1398" height="204" key="GridCell.Tab.0.center" timestamp="1580714110159">
+    <state width="1398" height="204" key="GridCell.Tab.0.center" timestamp="1580753043491">
       <screen x="0" y="0" width="1440" height="900" />
     </state>
-    <state width="1398" height="204" key="GridCell.Tab.0.center/0.0.1440.900@0.0.1440.900" timestamp="1580714110159" />
+    <state width="1398" height="204" key="GridCell.Tab.0.center/0.0.1440.900@0.0.1440.900" timestamp="1580753043491" />
     <state width="1398" height="204" key="GridCell.Tab.0.center/0.23.1440.797@0.23.1440.797" timestamp="1580706887660" />
-    <state width="1398" height="204" key="GridCell.Tab.0.left" timestamp="1580714110158">
+    <state width="1398" height="204" key="GridCell.Tab.0.left" timestamp="1580753043490">
       <screen x="0" y="0" width="1440" height="900" />
     </state>
-    <state width="1398" height="204" key="GridCell.Tab.0.left/0.0.1440.900@0.0.1440.900" timestamp="1580714110158" />
+    <state width="1398" height="204" key="GridCell.Tab.0.left/0.0.1440.900@0.0.1440.900" timestamp="1580753043490" />
     <state width="1398" height="204" key="GridCell.Tab.0.left/0.23.1440.797@0.23.1440.797" timestamp="1580706887659" />
-    <state width="1398" height="204" key="GridCell.Tab.0.right" timestamp="1580714110160">
+    <state width="1398" height="204" key="GridCell.Tab.0.right" timestamp="1580753043492">
       <screen x="0" y="0" width="1440" height="900" />
     </state>
-    <state width="1398" height="204" key="GridCell.Tab.0.right/0.0.1440.900@0.0.1440.900" timestamp="1580714110160" />
+    <state width="1398" height="204" key="GridCell.Tab.0.right/0.0.1440.900@0.0.1440.900" timestamp="1580753043492" />
     <state width="1398" height="204" key="GridCell.Tab.0.right/0.23.1440.797@0.23.1440.797" timestamp="1580706887661" />
     <state width="1398" height="261" key="GridCell.Tab.1.bottom" timestamp="1580626092580">
       <screen x="0" y="0" width="1440" height="900" />
@@ -357,10 +351,10 @@
       <screen x="0" y="0" width="1440" height="900" />
     </state>
     <state x="221" y="88" key="SettingsEditor/0.0.1440.900@0.0.1440.900" timestamp="1580562273160" />
-    <state x="320" y="190" key="Vcs.Push.Dialog.v2" timestamp="1580585085542">
+    <state x="320" y="190" key="Vcs.Push.Dialog.v2" timestamp="1580714192376">
       <screen x="0" y="0" width="1440" height="900" />
     </state>
-    <state x="320" y="190" key="Vcs.Push.Dialog.v2/0.0.1440.900@0.0.1440.900" timestamp="1580585085542" />
+    <state x="320" y="190" key="Vcs.Push.Dialog.v2/0.0.1440.900@0.0.1440.900" timestamp="1580714192376" />
     <state x="378" y="207" width="683" height="486" key="find.popup" timestamp="1578496174047">
       <screen x="0" y="0" width="1440" height="900" />
     </state>

src/q54/Solution.java

@@ -0,0 +1,72 @@
+package q54;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * 方向变量模拟路径 o(n)
+ */
+public class Solution {
+
+    public List<Integer> spiralOrder(int[][] matrix) {
+        List<Integer> rs = new ArrayList<>();
+        if (matrix.length == 0 || matrix[0].length == 0) {
+            return rs;
+        }
+        int m = matrix.length;
+        int n = matrix[0].length;
+        boolean[][] visited = new boolean[m][n];
+
+        int i = 0;
+        int j = 0;
+        int direction = 1;
+        while (true) {
+            if (i < 0 || j < 0 || i == m || j == n || visited[i][j]) {
+                break;
+            }
+            rs.add(matrix[i][j]);
+            visited[i][j] = true;
+            switch (direction) {
+                case 1:
+                    if (j + 1 == n || visited[i][j + 1]) {
+                        i++;
+                        direction = 2;
+                    } else {
+                        j++;
+                    }
+                    break;
+                case 2:
+                    if (i + 1 == m || visited[i + 1][j]) {
+                        j--;
+                        direction = 3;
+                    } else {
+                        i++;
+                    }
+                    break;
+                case 3:
+                    if (j == 0 || visited[i][j - 1]) {
+                        i--;
+                        direction = 4;
+                    } else {
+                        j--;
+                    }
+                    break;
+                case 4:
+                    if (visited[i - 1][j]) {
+                        j++;
+                        direction = 1;
+                    } else {
+                        i--;
+                    }
+                    break;
+                default:
+                    break;
+            }
+        }
+        return rs;
+    }
+
+    public static void main(String[] args) {
+        System.out.println(new Solution().spiralOrder(new int[][]{{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}));
+    }
+}