fix #3

Author: jdneo

Diff for: CHANGELOG.md

@@ -3,6 +3,10 @@ All notable changes to the "leetcode" extension will be documented in this file.
 
 Check [Keep a Changelog](http://keepachangelog.com/) for recommendations on how to structure this file.
 
+## [0.1.1]
+### Fixed
+- Fixed a bug in LeetCode Explorer [(#3)](https://github.com/jdneo/vscode-leetcode/issues/3)
+
 ## [0.1.0]
 ### Added
 - Sign in/out to LeetCode

Diff for: README.md

@@ -18,6 +18,16 @@ Solve LeetCode problems in VS Code.
 - Search problems by keywords
 - Submit solutions to LeetCode
 
+## Commands
+This extension provides several commands in the Command Palette (F1 or Ctrl + Shift + P):
+- **LeetCode: Sign in** -  Sign in to LeetCode
+- **LeetCode: Sign out** -  Sign out to LeetCode
+- **LeetCode: Select session** -  Select one session and make it active
+- **LeetCode: Create new session** -  Create a new session
+- **LeetCode: Refresh** -  Refresh the LeetCode Explorer
+- **LeetCode: Search Problem** -  Search for problems by keywords
+- **LeetCode: Submit** -  Submit the solution to LeetCode
+
 ### Sign In and Sign Out
 ![SignInOut](resources/gif/signinout.gif)
 
@@ -58,6 +68,16 @@ This extension is based on [@skygragon](https://github.com/skygragon)'s [leetcod
 - 根据关键字搜索题目
 - 向 LeetCode 提交答案
 
+## 命令
+该插件在命令面板（F1 或 Ctrl + Shift + P）中支持下列命令：
+- **LeetCode: Sign in** -  登入 LeetCode
+- **LeetCode: Sign out** -  登出 LeetCode
+- **LeetCode: Select session** -  激活一个已有的答题进度存档
+- **LeetCode: Create new session** -  创建一个新的答题进度存档
+- **LeetCode: Refresh** -  刷新左侧题目列表视图
+- **LeetCode: Search Problem** -  根据关键字搜索题目
+- **LeetCode: Submit** -  提交答案到 LeetCode
+
 ### 登入及登出
 ![SignInOut](resources/gif/signinout.gif)
 

Diff for: src/commands/show.ts

@@ -14,7 +14,7 @@ export async function showProblem(channel: vscode.OutputChannel, node?: LeetCode
     if (!node) {
         return;
     }
-    await showProblemInternal(channel, node.id);
+    await showProblemInternal(channel, node.id.split(".")[1]);
 }
 
 export async function searchProblem(channel: vscode.OutputChannel): Promise<void> {

Diff for: src/leetCodeExplorer.ts

@@ -58,9 +58,11 @@ export class LeetCodeTreeDataProvider implements vscode.TreeDataProvider<LeetCod
                 },
             };
         }
+
+        const idPrefix: number = Date.now();
         return {
             label: element.isProblem ? `[${element.id}] ${element.name}` : element.name,
-            id: element.id,
+            id: `${idPrefix}.${element.id}`,
             collapsibleState: element.isProblem ? vscode.TreeItemCollapsibleState.None : vscode.TreeItemCollapsibleState.Collapsed,
             contextValue: element.isProblem ? "problem" : "difficulty",
             iconPath: element.isProblem ?