diff --git a/day5/perfect/fix.cpp b/day5/perfect/fix.cpp
index e9481e8..fcfd0c2 100644
--- a/day5/perfect/fix.cpp
+++ b/day5/perfect/fix.cpp
@@ -5,24 +5,66 @@ const int MAX_N = 3e5+5;
 const int MAX_K = 19;
 int sMin[MAX_N][MAX_K];
 int sMax[MAX_N][MAX_K];
-int l[MAX_N];
+int l2[MAX_N];
 
 
-int main(){
+#ifndef OITEST
+#define PRINT_VALUE(v)
+#endif
+
+int main(int argc,char* argv[]){
+
+#ifdef OITEST
+    #define PRINT_VALUE(v){cout<<#v<<" :"<<(v)<<endl;}
+    PRINT_VALUE(argv[0])
+    string fileName="perfect";
+    assert(argc==2);
+    string num(argv[1]);
+    string inputFileName = fileName+num+".in";
+    string ansFileName = fileName+num+".ans";
+    auto ansFile = ifstream(ansFileName);
+    auto inputFile =ifstream(inputFileName);
+    int correctAns;
+    ansFile>>correctAns;
+    #define cin inputFile
+#endif
     cin.sync_with_stdio(false);
     cin.tie(0);
-    l[1]=0;
+    l2[0]=0;
+    l2[1]=0;
     int n;
     cin>>n;
     for(int i=1;i<=n;i++){
         cin>>sMin[i][0];
         sMax[i][0]=sMin[i][0];
-        if(i!=1)l[i]=l[(i>>1)]+1;
     }
-    int k=l[n]+1;
+    for(int i=2;i<=n;i++){
+        l2[i]=l2[i/2]+1;
+    }
+    int k=l2[n]+1;
     for(int j=1;j<=k;j++){
         for(int i=1;i+(1<<j)-1<=n;i++){
             sMax[i][j]=max(sMax[i][j-1],sMax[i+(1<<(j-1))][j-1]);
+            sMin[i][j]=min(sMin[i][j-1],sMin[i+(1<<(j-1))][j-1]);
         }
     }
+    int ans=INT_MIN;
+    for(int l=1;l<=n;l++){
+        for(int r=l;r<=n;r++){
+            int j=l2[r-l+1];
+            PRINT_VALUE(l)
+            PRINT_VALUE(r)
+            PRINT_VALUE(r-(1<<j)+1)
+            PRINT_VALUE(j);
+            int maxlr=max(sMax[l][j],sMax[r-(1<<j)+1][j]);
+            int minlr=min(sMin[l][j],sMin[r-(1<<j)+1][j]);
+            ans=max(ans,maxlr^minlr);
+        }
+    }
+    cout<<ans<<endl;
+#ifdef OITEST
+    PRINT_VALUE(ans);
+    PRINT_VALUE(correctAns);
+    assert(ans==correctAns);
+#endif
 }
\ No newline at end of file
diff --git a/xmake.lua b/xmake.lua
index 0f81123..4c24e43 100644
--- a/xmake.lua
+++ b/xmake.lua
@@ -28,7 +28,11 @@ target("binExp")
 target("fperfect")
     set_kind("binary")
     add_files("./day5/perfect/fix.cpp")
-    add_tests("fperfect",{files="././day5/perfect/fix.cpp",defines="OITEST"})
+    set_rundir("./day5/perfect/")
+    for val=1,4 do 
+        local strval = tostring(val)
+        add_tests(strval,{files="./day5/perfect/fix.cpp",defines="OITEST",runargs=strval,run_timeout=1000})
+    end 
 
 target("pre88")
     set_kind("binary")