diff --git a/20240823/十四届蓝桥比赛/八进制回文平方数.cpp b/20240823/十四届蓝桥比赛/八进制回文平方数.cpp
index b5da181..3aea3a5 100644
--- a/20240823/十四届蓝桥比赛/八进制回文平方数.cpp
+++ b/20240823/十四届蓝桥比赛/八进制回文平方数.cpp
@@ -15,7 +15,7 @@ bool is_huiwen(int n){
     ss<<std::oct<<n;
     string bjz(ss.str());
     int j=bjz.size()-1;
-    for(int i=0;i<bjz.size();++i,--j){
+    for(int i=0;i<(int)bjz.size();++i,--j){
         if(bjz[i]!=bjz[j]){
             return false;
         }
diff --git a/20240823/十四届蓝桥比赛/数独填数.cpp b/20240823/十四届蓝桥比赛/数独填数.cpp
index 7cc258b..9c62187 100644
--- a/20240823/十四届蓝桥比赛/数独填数.cpp
+++ b/20240823/十四届蓝桥比赛/数独填数.cpp
@@ -2,7 +2,7 @@
 using namespace std;
 
 int m[10][10];
-bool h_is_used[10][10],l_is_used[10][10],t_is_used[4][4][10];
+bool h_is_used[10][10],l_is_used[10][10],t_is_used[5][5][10];
 
 #ifdef OI
 #define DB(code){code}
diff --git a/20240830/P2661/P2661.cpp b/20240830/P2661/P2661.cpp
index 30f5800..d517541 100644
--- a/20240830/P2661/P2661.cpp
+++ b/20240830/P2661/P2661.cpp
@@ -30,7 +30,7 @@ int main(){
         }
     }
 
-    int ans{0};
+    int ans{-1};
 
     for(int i=1;i<=n;i++){
         if(in_degree[i]!=0 && vis[i]==false){
diff --git a/20240830/P4089/P4089.cpp b/20240830/P4089/P4089.cpp
index 0254b97..b77b1f1 100644
--- a/20240830/P4089/P4089.cpp
+++ b/20240830/P4089/P4089.cpp
@@ -17,7 +17,6 @@ int main(){
         in_degree[input]++;
         next[i]=input;
     }
-    int zero_in_degree_dir = -1;
     int cnt{};
     for(int i=1;i<=n;i++){
         if(in_degree[i]==0){