diff --git a/src/admin/problem/detail.vue b/src/admin/problem/detail.vue
index 72f2ab4..388c09c 100644
--- a/src/admin/problem/detail.vue
+++ b/src/admin/problem/detail.vue
@@ -269,10 +269,12 @@ function getTemplate() {
 }
 
 async function submit() {
-  const notComplete = detectProblemCompletion()
-  if (notComplete) return
+  const notCompleted = detectProblemCompletion()
+  if (notCompleted) return
   getTemplate()
   problem.tags = [...newTags.value, ...fromExistingTags.value]
+  // 因为编辑器的问题，删掉空白的 hint
+  if ((problem.hint = "<p><br></p>")) problem.hint = ""
   const api = {
     "admin problem create": createProblem,
     "admin problem edit": editProblem,
diff --git a/src/admin/problem/list.vue b/src/admin/problem/list.vue
index 2bb1600..9183172 100644
--- a/src/admin/problem/list.vue
+++ b/src/admin/problem/list.vue
@@ -45,7 +45,7 @@ const columns: DataTableColumn<AdminProblemFiltered>[] = [
     title: "创建时间",
     key: "create_time",
     width: 200,
-    render: (row) => parseTime(row.create_time, "YYYY-MM-DD hh:mm:ss"),
+    render: (row) => parseTime(row.create_time, "YYYY-MM-DD HH:mm:ss"),
   },
   {
     title: "可见",
diff --git a/src/admin/setting/config.vue b/src/admin/setting/config.vue
index caf659a..b738dad 100644
--- a/src/admin/setting/config.vue
+++ b/src/admin/setting/config.vue
@@ -79,13 +79,13 @@ const serverColumns: DataTableColumn<Server>[] = [
   {
     title: "上一次心跳",
     key: "last_heartbeat",
-    render: (row) => parseTime(row.last_heartbeat, "YYYY-MM-DD hh:mm:ss"),
+    render: (row) => parseTime(row.last_heartbeat, "YYYY-MM-DD HH:mm:ss"),
     width: 120,
   },
   {
     title: "创建时间",
     key: "create_time",
-    render: (row) => parseTime(row.create_time, "YYYY-MM-DD hh:mm:ss"),
+    render: (row) => parseTime(row.create_time, "YYYY-MM-DD HH:mm:ss"),
     width: 120,
   },
 ]
diff --git a/src/admin/user/list.vue b/src/admin/user/list.vue
index 1c77d95..da97fe6 100644
--- a/src/admin/user/list.vue
+++ b/src/admin/user/list.vue
@@ -35,7 +35,7 @@ const columns: DataTableColumn<User>[] = [
     title: "创建时间",
     key: "create_time",
     width: 200,
-    render: (row) => parseTime(row.create_time, "YYYY-MM-DD hh:mm:ss"),
+    render: (row) => parseTime(row.create_time, "YYYY-MM-DD HH:mm:ss"),
   },
   {
     title: "上次登录",
@@ -43,7 +43,7 @@ const columns: DataTableColumn<User>[] = [
     width: 200,
     render: (row) =>
       row.last_login
-        ? parseTime(row.last_login, "YYYY-MM-DD hh:mm:ss")
+        ? parseTime(row.last_login, "YYYY-MM-DD HH:mm:ss")
         : "从未登录",
   },
   { title: "真名", key: "real_name", width: 100 },
diff --git a/src/oj/composables/code.ts b/src/oj/composables/code.ts
index 6448533..02cc9ab 100644
--- a/src/oj/composables/code.ts
+++ b/src/oj/composables/code.ts
@@ -4,5 +4,5 @@ import { Code } from "~/utils/types"
 
 export const code = reactive<Code>({
   value: "",
-  language: storage.get(STORAGE_KEY.LANGUAGE) || "C",
+  language: storage.get(STORAGE_KEY.LANGUAGE) || "Python3",
 })
diff --git a/src/oj/contest/components/ContestInfo.vue b/src/oj/contest/components/ContestInfo.vue
index f620553..ffa6cde 100644
--- a/src/oj/contest/components/ContestInfo.vue
+++ b/src/oj/contest/components/ContestInfo.vue
@@ -25,11 +25,11 @@ const contestStore = useContestStore()
     <n-descriptions bordered label-placement="left" :column="1">
       <n-descriptions-item label="开始时间">
         {{
-          parseTime(contestStore.contest.start_time, "YYYY年M月D日 hh:mm:ss")
+          parseTime(contestStore.contest.start_time, "YYYY年M月D日 HH:mm:ss")
         }}
       </n-descriptions-item>
       <n-descriptions-item label="结束时间">
-        {{ parseTime(contestStore.contest.end_time, "YYYY年M月D日 hh:mm:ss") }}
+        {{ parseTime(contestStore.contest.end_time, "YYYY年M月D日 HH:mm:ss") }}
       </n-descriptions-item>
       <n-descriptions-item label="比赛类型">
         <ContestType :contest="contestStore.contest" />
diff --git a/src/oj/problem/components/ProblemContent.vue b/src/oj/problem/components/ProblemContent.vue
index 9d0001b..a0256ec 100644
--- a/src/oj/problem/components/ProblemContent.vue
+++ b/src/oj/problem/components/ProblemContent.vue
@@ -184,6 +184,10 @@ function type(status: ProblemStatus) {
   margin-bottom: 8px;
 }
 
+.problemContent > .content > p {
+  margin: 0;
+}
+
 .problemContent > .content > blockquote {
   border-left: 3px solid #bbbec4;
   padding-left: 10px;
@@ -251,4 +255,8 @@ function type(status: ProblemStatus) {
   border-radius: 3px;
   line-height: 1.5;
 }
+
+.problemContent > .content a {
+  color: #18a058;
+}
 </style>
diff --git a/src/oj/problem/components/ProblemSubmission.vue b/src/oj/problem/components/ProblemSubmission.vue
index d2195f7..5ce69f9 100644
--- a/src/oj/problem/components/ProblemSubmission.vue
+++ b/src/oj/problem/components/ProblemSubmission.vue
@@ -21,7 +21,7 @@ const columns: DataTableColumn<Submission>[] = [
     render: (row) =>
       parseTime(
         row.create_time,
-        isDesktop ? "YYYY-MM-DD hh:mm:ss" : "M-D hh:mm"
+        isDesktop ? "YYYY-MM-DD HH:mm:ss" : "M-D hh:mm"
       ),
   },
   {
diff --git a/src/oj/submission/list.vue b/src/oj/submission/list.vue
index c37480d..e3d4475 100644
--- a/src/oj/submission/list.vue
+++ b/src/oj/submission/list.vue
@@ -123,7 +123,7 @@ const columns = computed(() => {
       render: (row) =>
         parseTime(
           row.create_time,
-          isDesktop ? "YYYY-MM-DD hh:mm:ss" : "M-D hh:mm"
+          isDesktop ? "YYYY-MM-DD HH:mm:ss" : "M-D hh:mm"
         ),
     },
     {