更新 workspace.xml

.idea/workspace.xml

@@ -5,15 +5,20 @@
   </component>
   <component name="ChangeListManager">
     <list default="true" id="45f625e1-36c7-4942-8f7c-ba3ebe9a7d53" name="变更" comment="">
-      <change afterPath="$PROJECT_DIR$/README.md" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/Solution.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/Solution.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/.gitignore" beforeDir="false" afterPath="$PROJECT_DIR$/.gitignore" 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" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
     <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
     <option name="LAST_RESOLUTION" value="IGNORE" />
   </component>
+  <component name="FileTemplateManagerImpl">
+    <option name="RECENT_TEMPLATES">
+      <list>
+        <option value="Class" />
+      </list>
+    </option>
+  </component>
   <component name="Git.Settings">
     <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
   </component>
@@ -50,7 +55,7 @@
       <option name="number" value="Default" />
       <option name="presentableId" value="Default" />
       <updated>1693822719192</updated>
-      <workItem from="1693822720224" duration="784000" />
+      <workItem from="1693822720224" duration="1148000" />
     </task>
     <servers />
   </component>

src/Solution.java

@@ -1,2 +1,15 @@
+import java.util.HashSet;
+import java.util.Set;
+
 public class Solution {
+    public int lengthOfLongestSubstring(String s) {
+        if (s != null){
+            Set<Character> stringList = new HashSet<>();
+            for (int i = 0; i < s.length(); i++) {
+                stringList.add(s.charAt(i));
+            }
+            return stringList.size();
+        }
+        return 0;
+    }
 }