diff --git a/application/components/problem/solution/program.vue b/application/components/problem/solution/program.vue
index b802c0a..76360aa 100644
--- a/application/components/problem/solution/program.vue
+++ b/application/components/problem/solution/program.vue
@@ -1,11 +1,70 @@
 <template>
+  <client-only>
+    <vue-monaco-editor
+      :options="options"
+      :language="answers.language ?? 'text'"
+      v-model:value="answers.code"
+      class="min-h-[360px] code-editor"
+    />
+  </client-only>
 
+  <n-divider class="mx-[-24px] w-[calc(100%+48px)] divider-below-code" />
+
+  <section>
+    <n-space>
+      <n-select
+        :options="languages"
+        v-model:value="answers.language"
+        placeholder="Programming Language"
+        class="w-120"
+      />
+    </n-space>
+  </section>
 </template>
 
 <script setup lang="ts">
+import { NDivider, NSpace, NSelect } from "naive-ui";
+import { VueMonacoEditor } from "@guolao/vue-monaco-editor";
 
+const props = defineProps<{
+  challenge: any,
+  problem: any,
+  answers: any,
+}>();
+const emits = defineEmits(["update:answers"]);
+
+const answers = ref(props.challenge?.answers ?? {});
+
+watch(answers, (v) => {
+  emits("update:answers", v);
+});
+
+const options = {
+  minimap: { enabled: false }
+};
+
+const languageWhitelist: string[] = props.problem?.languageWhitelist ?? [];
+const languageBlacklist: string[] = props.problem?.languageBlacklist ?? [];
+
+const languages = [
+  { label: "C", value: "c" },
+  { label: "C++", value: "cpp" },
+  { label: "JSON", value: "json" }, // Huh?
+].filter((item) => {
+  return languageWhitelist.filter((x) => new RegExp(x, item.value)).length > 0 ||
+    !(languageBlacklist.filter((x) => new RegExp(x, item.value)).length > 0);
+});
 </script>
 
 <style scoped>
+.code-editor {
+  min-width: calc(100% + 48px);
+  margin-top: -20px;
+  margin-left: -24px;
+  margin-right: -24px;
+}
 
-</style>
\ No newline at end of file
+.divider-below-code {
+  margin-top: 0 !important;
+}
+</style>
diff --git a/application/pages/challenges/[id].vue b/application/pages/challenges/[id].vue
index 684759b..5ec251a 100644
--- a/application/pages/challenges/[id].vue
+++ b/application/pages/challenges/[id].vue
@@ -12,15 +12,14 @@
         </n-page-header>
       </template>
 
-      <client-only>
-        <vue-monaco-editor
-          :options="options"
-          v-model:value="answer.code"
-          class="min-h-[360px] code-editor"
+      <section>
+        <problem-solution-program
+          v-if="problem.type === 'programming'"
+          v-model:answers="answers"
+          :challenge="challenge"
+          :problem="problem"
         />
-      </client-only>
-
-      <n-divider class="mx-[-24px] w-[calc(100%+48px)] divider-below-code" />
+      </section>
 
       <template #action>
         <div class="w-full flex justify-between">
@@ -42,8 +41,7 @@
 </template>
 
 <script setup lang="ts">
-import { NButton, NCard, NDivider, NPageHeader, NTag, NIcon, useDialog, useMessage } from "naive-ui";
-import { VueMonacoEditor } from "@guolao/vue-monaco-editor";
+import { NButton, NCard, NPageHeader, NTag, NIcon, useDialog, useMessage } from "naive-ui";
 import { Save } from "@vicons/carbon";
 
 const route = useRoute();
@@ -51,10 +49,6 @@ const client = useSupabaseClient();
 const message = useMessage();
 const dialog = useDialog();
 
-const options = {
-  minimap: { enabled: false }
-};
-
 const submitting = ref(false);
 
 const { data: challenge } = await client
@@ -63,16 +57,48 @@ const { data: challenge } = await client
   .eq("id", route.params.id)
   .single();
 
+const { data: problem } = await client
+  .from("problems")
+  .select<any, any>("*")
+  .eq("id", challenge?.problem)
+  .single();
+
 useHead({
   title: challenge ? `挑战 #${challenge.id}` : "挑战 #404"
 });
 
-const answer = ref(challenge?.answer ?? {});
+const answers = ref(challenge?.answers ?? {});
 
 async function save() {
+  submitting.value = true;
+  const instance = message.loading("正在保存，请稍后……");
 
+  const { error } = await client
+    .from("challenges")
+    // @ts-ignore
+    .update<any>({
+      answers: answers.value
+    })
+    .eq("id", challenge.id);
+
+  if (error != null) {
+    message.error(`Something went wrong... ${error.message}`);
+  }
+
+  instance.destroy();
+  submitting.value = false;
 }
 
+onMounted(() => {
+  document.addEventListener("keydown", (event) => {
+    const prefixKey = navigator.platform.indexOf("Mac") == 0 ? event.metaKey : event.ctrlKey;
+    if (prefixKey && event.key == "s") {
+      event.preventDefault();
+      save();
+    }
+  });
+});
+
 function abandon() {
   const instance = dialog.warning({
     title: "警告",
@@ -88,7 +114,7 @@ function abandon() {
 
       const delay = (ms: number) => new Promise(res => setTimeout(res, ms));
 
-      instance.loading = true
+      instance.loading = true;
       message.info("已放弃挑战该题");
 
       await delay(1850);
@@ -101,16 +127,3 @@ async function submit() {
 
 }
 </script>
-
-<style scoped>
-.code-editor {
-  min-width: calc(100% + 48px);
-  margin-top: -20px;
-  margin-left: -24px;
-  margin-right: -24px;
-}
-
-.divider-below-code {
-  margin-top: 0 !important;
-}
-</style>
diff --git a/supabase/migrations/20231210135930_challenges.sql b/supabase/migrations/20231210135930_challenges.sql
index ab57fb1..1a4a7ec 100644
--- a/supabase/migrations/20231210135930_challenges.sql
+++ b/supabase/migrations/20231210135930_challenges.sql
@@ -32,5 +32,5 @@ policy "Enable update access for users' own items" on "public"."challenges"
 as permissive for
 update
     to public
-    using (author = auth.uid())
+    using (author = auth.uid() and status = 'in-progress')
 with check (author = auth.uid())
\ No newline at end of file