update.

src/oj/contest/list.vue

@@ -128,8 +128,8 @@ function rowProps(row: Contest) {
             v-model:value="query.status"
           />
         </n-form-item>
-        <n-form-item label="搜索">
-          <n-input clearable @change="search" />
+        <n-form-item>
+          <n-input clearable @change="search" placeholder="比赛标题" />
         </n-form-item>
       </n-form>
       <n-form :show-feedback="false" label-placement="left" inline>

src/oj/problem/list.vue

@@ -189,7 +189,7 @@ function rowProps(row: ProblemFiltered) {
   <n-space vertical size="large">
     <n-space>
       <n-form :show-feedback="false" inline label-placement="left">
-        <n-form-item label="难度">
+        <n-form-item label="题目难度">
           <n-select
             class="select"
             v-model:value="query.difficulty"

src/oj/submission/list.vue

@@ -248,8 +248,8 @@ const columns = computed(() => {
         </n-form-item>
       </n-form>
       <n-form :show-feedback="false" inline label-placement="left">
-        <n-form-item label="搜索用户">
-          <n-input clearable @change="search" />
+        <n-form-item>
+          <n-input clearable @change="search" placeholder="用户" />
         </n-form-item>
         <n-form-item>
           <n-button @click="search(query.username)">搜索</n-button>