diff --git a/20240828/P2615/P2615.cpp b/20240828/P2615/P2615.cpp
new file mode 100644
index 0000000..0075666
--- /dev/null
+++ b/20240828/P2615/P2615.cpp
@@ -0,0 +1,44 @@
+//AC
+#include <iostream>
+using namespace std;
+
+const int MAX_N=39+5;
+
+int main(){
+    ios::sync_with_stdio(false),cin.tie(0),cout.tie(0);
+
+    int n;
+    cin>>n;
+    n=n/2*2+1;
+    int a[MAX_N][MAX_N];
+    for(int i=0;i<MAX_N;i++){
+        for(int j=0;j<MAX_N;j++){
+            a[i][j]=0;
+        }
+    }
+    const int pow_n = n*n;
+    int x=1,y=n/2+1;
+    a[x][y]=1;
+    for(int i=2;i<=pow_n;i++){
+        if(x==1&&y!=n){
+            x=n,y+=1;
+        }else if(y==n&&x!=1){
+            x-=1,y=1;
+        }else if(x==1&&y==n){
+            x+=1;
+        }else if(x!=1&&y!=n){
+            if(a[x-1][y+1]==0){
+                x-=1,y+=1;
+            }else{
+                x+=1;
+            }
+        }
+        a[x][y]=i;
+    }
+    for(int i=1;i<=n;i++){
+        for(int j=1;j<=n;j++){
+            cout<<a[i][j]<<" ";
+        }
+        cout<<endl;
+    }
+}
\ No newline at end of file
diff --git a/xmake.lua b/xmake.lua
index 7f0e66f..4cf3b70 100644
--- a/xmake.lua
+++ b/xmake.lua
@@ -3,6 +3,9 @@ if is_mode("debug") then
     -- add_cxxflags("-O2","-DOI")
     add_cxxflags("-DOI")
 end 
+if is_mode("release") then 
+    -- add_cxxflags("-march=native")
+end 
 set_languages("c++17")
 
 target("P1158")
@@ -19,4 +22,7 @@ target("lq14jd")
     add_files("20240823/十四届蓝桥比赛/简单算术题.cpp")
 
 target("lq14sd")
-    add_files("20240823/十四届蓝桥比赛/数独填数.cpp")
\ No newline at end of file
+    add_files("20240823/十四届蓝桥比赛/数独填数.cpp")
+
+target("P2615")
+    add_files("20240828/P2615/P2615.cpp")
\ No newline at end of file