diff --git a/day5/perfect/fix.cpp b/day5/perfect/fix.cpp
new file mode 100644
index 0000000..e9481e8
--- /dev/null
+++ b/day5/perfect/fix.cpp
@@ -0,0 +1,28 @@
+#include<bits/stdc++.h>
+using namespace std;
+
+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 main(){
+    cin.sync_with_stdio(false);
+    cin.tie(0);
+    l[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 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]);
+        }
+    }
+}
\ No newline at end of file
diff --git a/day6/CSP-S1 模拟赛.pdf b/day6/CSP-S1 模拟赛.pdf
new file mode 100644
index 0000000..2614d76
Binary files /dev/null and b/day6/CSP-S1 模拟赛.pdf differ
diff --git a/day6/binaryExponentiation/binaryExponentiation.cpp b/day6/binaryExponentiation/binaryExponentiation.cpp
index c43dc85..d593524 100644
--- a/day6/binaryExponentiation/binaryExponentiation.cpp
+++ b/day6/binaryExponentiation/binaryExponentiation.cpp
@@ -27,9 +27,7 @@ signed main(){
 #endif
 
 #ifdef ISTEST
-#define assertr(e){if(!(e)){cerr<<"error on "<<#e<<" :"<<"False"<<endl;return -1;}else{cout<<#e<<" Passed OK!";}}
-
 int main(){
-    assertr(binExp(2, 10, 9)==7);
+    assert(binExp(2, 10, 9)==7);
 }
 #endif
\ No newline at end of file
diff --git a/day6/pre88/pre88.cpp b/day6/pre88/pre88.cpp
new file mode 100644
index 0000000..06edf50
--- /dev/null
+++ b/day6/pre88/pre88.cpp
@@ -0,0 +1,23 @@
+#include<bits/stdc++.h>
+using namespace std;
+
+string s1,s2,s3,s4,s5,s6;
+
+/*
+1.B 2.B
+
+*/
+
+int main() {
+    s1 = "ABCDABCDABCDABC";
+    s2 = "TFTFAB";
+    s3 = "TFTABC";
+    s4 = "TFTABC";
+    s5 = "ABCDA";
+    s6 = "ABCDA";
+    
+    string ans = s1 + s2 + s3 + s4 + s5 + s6;
+    assert(ans.length() == 43);
+    cout<<ans;
+    return 0;
+}
\ No newline at end of file
diff --git a/xmake.lua b/xmake.lua
index a6d4529..0f81123 100644
--- a/xmake.lua
+++ b/xmake.lua
@@ -23,4 +23,13 @@ target("P3865")
 target("binExp")
     set_kind("binary")
     add_files("./day6/binaryExponentiation/*.cpp")
-    add_tests("binExp",{files="./day6/binaryExponentiation/*.cpp",defines = "ISTEST"})
\ No newline at end of file
+    add_tests("binExp",{files="./day6/binaryExponentiation/*.cpp",defines = "ISTEST"})
+
+target("fperfect")
+    set_kind("binary")
+    add_files("./day5/perfect/fix.cpp")
+    add_tests("fperfect",{files="././day5/perfect/fix.cpp",defines="OITEST"})
+
+target("pre88")
+    set_kind("binary")
+    add_files("./day6/pre88/*.cpp")
\ No newline at end of file