diff --git a/Update.json b/Update.json
index b1d2d6cf..96f64b2d 100644
--- a/Update.json
+++ b/Update.json
@@ -3113,6 +3113,17 @@
                 }
             ],
             "Notes": "因为它利用的bug被修复了"
+        },
+        "2.4.4": {
+            "UpdateDate": 1759417362937,
+            "Prerelease": true,
+            "UpdateContents": [
+                {
+                    "PR": 866,
+                    "Description": "比赛题目页面里左侧栏加入题目序号列表"
+                }
+            ],
+            "Notes": "#860 ..."
         }
     }
 }
\ No newline at end of file
diff --git a/XMOJ.user.js b/XMOJ.user.js
index 812c41a0..69dfca7f 100644
--- a/XMOJ.user.js
+++ b/XMOJ.user.js
@@ -1,6 +1,6 @@
 // ==UserScript==
 // @name         XMOJ
-// @version      2.4.3
+// @version      2.4.4
 // @description  XMOJ增强脚本
 // @author       @XMOJ-Script-dev, @langningchen and the community
 // @namespace    https://github/langningchen
@@ -1506,6 +1506,8 @@ async function main() {
                         }, {
                             "ID": "RefreshSolution", "Type": "F", "Name": "状态页面结果自动刷新每次只能刷新一个"
                         }, {"ID": "CopyMD", "Type": "A", "Name": "复制题目或题解内容"}, {
+                            "ID": "ProblemSwitcher", "Type": "A", "Name": "比赛题目切换器"
+                        }, {
                             "ID": "OpenAllProblem", "Type": "A", "Name": "比赛题目界面一键打开所有题目"
                         }, {
                             "ID": "CheckCode", "Type": "A", "Name": "提交代码前对代码进行检查", "Children": [{
@@ -1642,8 +1644,60 @@ async function main() {
                     }
                 } else if (location.pathname == "/problem.php") {
                     await RenderMathJax();
-                    if (SearchParams.get("cid") != null) {
+                    if (SearchParams.get("cid") != null && UtilityEnabled("ProblemSwitcher")) {
                         document.getElementsByTagName("h2")[0].innerHTML += " (" + localStorage.getItem("UserScript-Contest-" + SearchParams.get("cid") + "-Problem-" + SearchParams.get("pid") + "-PID") + ")";
+                        let ContestProblemList = localStorage.getItem("UserScript-Contest-" + SearchParams.get("cid") + "-ProblemList");
+                        if (ContestProblemList == null) {
+                            const contestReq = await fetch("https://www.xmoj.tech/contest.php?cid=" + SearchParams.get("cid"));
+                            const res = await contestReq.text();
+                            if (contestReq.status === 200 && res.indexOf("比赛尚未开始或私有，不能查看题目。") === -1) {
+                                const parser = new DOMParser();
+                                const dom = parser.parseFromString(res, "text/html");
+                                const rows = (dom.querySelector("#problemset > tbody")).rows;
+                                let problemList = [];
+                                for (let i = 0; i < rows.length; i++) {
+                                    problemList.push({
+                                        "title": rows[i].children[2].innerText,
+                                        "url": rows[i].children[2].children[0].href
+                                    });
+                                }
+                                localStorage.setItem("UserScript-Contest-" + SearchParams.get("cid") + "-ProblemList", JSON.stringify(problemList));
+                                ContestProblemList = JSON.stringify(problemList);
+                            }
+                        }
+
+                        let problemSwitcher = document.createElement("div");
+                        problemSwitcher.style.position = "fixed";
+                        problemSwitcher.style.top = "50%";
+                        problemSwitcher.style.left = "0";
+                        problemSwitcher.style.transform = "translateY(-50%)";
+                        problemSwitcher.style.maxHeight = "80vh";
+                        problemSwitcher.style.overflowY = "auto";
+                        if (document.querySelector("html").getAttribute("data-bs-theme") == "dark") {
+                            problemSwitcher.style.backgroundColor = "rgba(0, 0, 0, 0.8)";
+                        } else {
+                            problemSwitcher.style.backgroundColor = "rgba(255, 255, 255, 0.8)";
+                        }
+                        problemSwitcher.style.padding = "10px";
+                        problemSwitcher.style.borderRadius = "0 10px 10px 0";
+                        problemSwitcher.style.display = "flex";
+                        problemSwitcher.style.flexDirection = "column";
+
+                        let problemList = JSON.parse(ContestProblemList);
+                        for (let i = 0; i < problemList.length; i++) {
+                            let buttonText = "";
+                            if (i < 26) {
+                                buttonText = String.fromCharCode(65 + i);
+                            } else {
+                                buttonText = String.fromCharCode(97 + (i - 26));
+                            }
+                            let activeClass = "";
+                            if (problemList[i].url === location.href) {
+                                activeClass = "active";
+                            }
+                            problemSwitcher.innerHTML += `<a href="${problemList[i].url}" class="btn btn-outline-secondary mb-2 ${activeClass}">${buttonText}</a>`;
+                        }
+                        document.body.appendChild(problemSwitcher);
                     }
                     if (document.querySelector("body > div > div.mt-3 > h2") != null) {
                         document.querySelector("body > div > div.mt-3").innerHTML = "没有此题目或题目对你不可见";
diff --git a/package.json b/package.json
index 8bee29cf..169470fd 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "xmoj-script",
-  "version": "2.4.3",
+  "version": "2.4.4",
   "description": "an improvement script for xmoj.tech",
   "main": "AddonScript.js",
   "scripts": {