diff --git a/README.md b/README.md
index 8c67b25..6d86d33 100644
--- a/README.md
+++ b/README.md
@@ -73,6 +73,12 @@ ll ksm(ll a,ll b,ll M){
 >点击跳转
 [自己手动实践](./day5/RMQ/st.cpp)
 
+## Day6
+[CSP-S1 模拟赛.pdf](./day6/CSP-S1%20模拟赛.pdf)
+>??:4.13.14.20.21
+## T9
+1. 先与后或先&后|
+
 # 排序
 ## 稳定性
 >隔着老远swap一般不稳定
diff --git a/day6/CSP-S1 模拟赛.pdf b/day6/CSP-S1 模拟赛.pdf
index 2614d76..6381cf8 100644
Binary files a/day6/CSP-S1 模拟赛.pdf and b/day6/CSP-S1 模拟赛.pdf differ
diff --git a/day6/pre88/pre88.cpp b/day6/pre88/pre88.cpp
index 06edf50..cc66bf0 100644
--- a/day6/pre88/pre88.cpp
+++ b/day6/pre88/pre88.cpp
@@ -4,17 +4,30 @@ using namespace std;
 string s1,s2,s3,s4,s5,s6;
 
 /*
-1.B 2.B
+??:4.13.14.20.21
+
+1.B 2.B 3.A 4.B 5.A 6.B 7.D 8.C 9.B 10.A 11.D 12.A 13.A 14.B 15.A
+16.T 17.T 18.F 19.F 20.D 21.B
+22.T 23.F 24.T 25.C 26.D 27.C
+28.F 29.F 30.T 31.D 32.A 33.A
+34.C 35.C 36.B 37.B 38.D
+39.A 40.D 41.D 42.A 43.B
+
+*/
+/*
+
+correct ans
+9.B
 
 */
 
 int main() {
-    s1 = "ABCDABCDABCDABC";
-    s2 = "TFTFAB";
-    s3 = "TFTABC";
-    s4 = "TFTABC";
-    s5 = "ABCDA";
-    s6 = "ABCDA";
+    s1 = "BBABABDCBADAABA";
+    s2 = "TTFFDB";
+    s3 = "TFTCDC";
+    s4 = "FFTDAA";
+    s5 = "CCBBD";
+    s6 = "ADDAB";
     
     string ans = s1 + s2 + s3 + s4 + s5 + s6;
     assert(ans.length() == 43);