diff --git a/README.md b/README.md
index 6d86d33..e6ec0af 100644
--- a/README.md
+++ b/README.md
@@ -79,6 +79,10 @@ ll ksm(ll a,ll b,ll M){
 ## T9
 1. 先与后或先&后|
 
+## Day7
+### 离线算法和在线算法
+>有预处理和没有预处理的区别
+
 # 排序
 ## 稳定性
 >隔着老远swap一般不稳定
diff --git a/day5/perfect/fix.cpp b/day5/perfect/fix.cpp
index e221f58..94822c9 100644
--- a/day5/perfect/fix.cpp
+++ b/day5/perfect/fix.cpp
@@ -13,7 +13,6 @@ int l2[MAX_N];
 #endif
 
 int main(int argc,char* argv[]){
-
 #ifdef OITEST
     // #define PRINT_VALUE(v){cout<<#v<<" :"<<(v)<<endl;}
     // PRINT_VALUE(argv[0])
diff --git a/day6/inverse/inverse_by_chat.pdf b/day6/inverse/inverse_by_chat.pdf
deleted file mode 100644
index f332fea..0000000
Binary files a/day6/inverse/inverse_by_chat.pdf and /dev/null differ
diff --git a/day6/inverse/inverse_by_chat.md b/day7/inverse/inverse_by_chat.md
similarity index 100%
rename from day6/inverse/inverse_by_chat.md
rename to day7/inverse/inverse_by_chat.md
diff --git a/day7/inverse/inverse_by_chat.pdf b/day7/inverse/inverse_by_chat.pdf
new file mode 100644
index 0000000..0e1a560
Binary files /dev/null and b/day7/inverse/inverse_by_chat.pdf differ
diff --git a/test.cpp b/test.cpp
index 5795068..dc421a6 100644
--- a/test.cpp
+++ b/test.cpp
@@ -1,6 +1,28 @@
 #include <bits/stdc++.h>
 using namespace std;
+#define int long long 
 
-int main(){
-    cout<<(8>>1)<<endl;
+
+
+signed main(){
+    int b,e,m;
+    #ifdef OITEST
+    b=2;e=10;m=9;
+    #endif
+    #ifndef OITEST
+    cin>>b>>e>>m;
+    #endif
+    
+    int r=1;
+    while(e>0){
+        if (e%2==1) {
+            r=(r*b)%m;
+        }
+        e=(e>>1);
+        b=(b*b)%m;
+    }
+    cout<<r<<endl;
+    #ifdef OITEST
+    assert(r==7);
+    #endif
 }
\ No newline at end of file
diff --git a/xmake.lua b/xmake.lua
index a9f2d26..f2f15e2 100644
--- a/xmake.lua
+++ b/xmake.lua
@@ -14,7 +14,8 @@ target("st_done")
 
 target("test")
     set_kind("binary")
-    add_files("test.cpp")
+    add_files("./test.cpp")
+    add_tests("1",{files="./test.cpp",defines="OITEST",run_timeout=1000})
 
 target("P3865")
     set_kind("binary")
@@ -29,7 +30,7 @@ target("fperfect")
     set_kind("binary")
     add_files("./day5/perfect/fix.cpp")
     set_rundir("./day5/perfect/")
-    for val=1,4 do --test 3,4
+    for val=1,4 do
         local strval = tostring(val)
         add_tests(strval,{files="./day5/perfect/fix.cpp",defines="OITEST",runargs=strval,run_timeout=2000})
     end