diff --git a/luogu/njit-baidu2023/tc.py b/luogu/njit-baidu2023/tc.py
index 749fb20..484573c 100644
--- a/luogu/njit-baidu2023/tc.py
+++ b/luogu/njit-baidu2023/tc.py
@@ -10,24 +10,16 @@ sys.stdin = io.StringIO('''3
 1 4 3 2''')
 
 
-# TLE
-def fun(n, p):
+def fun(n, loc):
     ans = [0] * n
-    loc = [0] * n
-    for i in range(n):
-        loc[i] = (p.index(i + 1))
+    ans[0] = 1
 
-    for i in range(n):
-        nums = loc[:i + 1]
-        nums.sort()
-        flag = True
-        for j in range(1, i + 1):
-            if nums[j] - nums[j - 1] > 1:
-                flag = False
-                break
-
-        if flag:
-            ans[i] = 1
+    l, r = loc[1], loc[1]
+    for i in range(2, n + 1):
+        l = min(l, loc[i])
+        r = max(r, loc[i])
+        if r - l + 1 == i:
+            ans[i - 1] = 1
 
     print(''.join(map(str, ans)))
 
@@ -35,8 +27,15 @@ def fun(n, p):
 t = int(input())
 for _ in range(t):
     n = int(input())
-    p = list(map(int, input().split()))
-    fun(n, p)
+    p = []
+    loc = [0] * (n + 1)
+    nums = input().split()
+    for i in range(n):
+        num = int(nums[i])
+        p.append(num)
+        loc[num] = i
 
-    if __name__ == '__main__':
-        pass
+    fun(n, loc)
+
+if __name__ == '__main__':
+    pass