diff --git a/TangDou/Topic/PrefixAndSuffix/P1115_Prefix.cpp b/TangDou/Topic/PrefixAndSuffix/P1115_Prefix.cpp
index 68ef708..001b4c3 100644
--- a/TangDou/Topic/PrefixAndSuffix/P1115_Prefix.cpp
+++ b/TangDou/Topic/PrefixAndSuffix/P1115_Prefix.cpp
@@ -1,7 +1,6 @@
 #include <bits/stdc++.h>
 using namespace std;
 const int N = 200100;
-const int INF = 0x3f3f3f3f;
 int n, a[N], s[N], ans[N];
 
 int main() {
@@ -14,7 +13,7 @@ int main() {
         ans[i] = s[i] - mi;
         mi = min(mi, s[i]);
     }
-    int res = -INF;
+    int res = INT_MIN;
     for (int i = 1; i <= n; i++) res = max(res, ans[i]);
     cout << res << endl;
     return 0;
diff --git a/TangDou/Topic/【前缀和与差分】题单.md b/TangDou/Topic/【前缀和与差分】题单.md
index 13e002d..6e2d0df 100644
--- a/TangDou/Topic/【前缀和与差分】题单.md
+++ b/TangDou/Topic/【前缀和与差分】题单.md
@@ -27,7 +27,6 @@
 #include <bits/stdc++.h>
 using namespace std;
 const int N = 200100;
-const int INF = 0x3f3f3f3f;
 int n, a[N], s[N], ans[N];
 
 int main() {
@@ -40,7 +39,7 @@ int main() {
         ans[i] = s[i] - mi;
         mi = min(mi, s[i]);
     }
-    int res = -INF;
+    int res = INT_MIN;
     for (int i = 1; i <= n; i++) res = max(res, ans[i]);
     cout << res << endl;
     return 0;