diff --git a/1.cpp b/1.cpp
new file mode 100644
index 0000000..8fe2142
--- /dev/null
+++ b/1.cpp
@@ -0,0 +1,22 @@
+#include<bits/stdc++.h>
+
+using namespace std;
+
+int main(){
+    int a = 0,b = 0,c = 0,all = 0;
+    int n;
+    cin >>n;
+
+    for (int i = 0; i < n; i++)
+    {
+        int a1,b1,c1;
+        cin >>a1>>b1>>c1;
+
+        a += a1;
+        b += b1;
+        c += c1;
+        all = a+b+c;
+    }
+    cout <<a<<" "<<b<<" "<<c<<" "<<all<<endl;
+    return 0;
+}
\ No newline at end of file
diff --git a/2.cpp b/2.cpp
new file mode 100644
index 0000000..bbb0dfc
--- /dev/null
+++ b/2.cpp
@@ -0,0 +1,27 @@
+#include<bits/stdc++.h>
+
+using namespace std;
+
+int main(){
+    cout <<"提示:最大四位数"<<endl;
+    int n,num,count = 0;
+    int a,b,c,d;
+
+    cin >>n;
+    for (int i = 0; i < n; i++)
+    {
+        cin >>num;
+
+        int a = num / 1000;          // 千位
+        int b = (num % 1000) / 100;  // 百位
+        int c = (num % 100) / 10;    // 十位
+        int d = num % 10;            // 个位
+        
+        if (a+b+c < d)
+        {
+            count++;
+        }
+    }
+    cout <<count;
+    return 0;
+}
\ No newline at end of file
diff --git a/2025.2.28.cpp b/2025.2.28.cpp
deleted file mode 100644
index 63cc34d..0000000
--- a/2025.2.28.cpp
+++ /dev/null
@@ -1,8 +0,0 @@
-#include<bits/stdc++.h>
-
-using namespace std;
-
-int main(){
-    
-    return 0;
-}
\ No newline at end of file