update in class

含有3的数字

class/class_test.cpp

@@ -11,7 +11,7 @@ int main(){
 
     cin >>a>>b>>c;
 
-    /*if (a = 1)
+    if (a = 1)
     {
         cout <<"no";
         Sleep(1000);
@@ -43,9 +43,7 @@ int main(){
     
     return 0;
 }
-*/
 
-/*
 int main(){  //三角形判断
     int a,b,c;
 
@@ -83,7 +81,7 @@ int main() {
     }
     
     return 0;
-}*/
+}
 
 int main(){
     int n = 6;
@@ -93,5 +91,19 @@ int main(){
     int sum = n * (n+1) /2;
 
     cout <<sum;
+    return 0;
+}*/
+
+int main(){
+    int count = 0;
+    for (int i = 1; i < 1000; ++i)
+    {
+        if (to_string(i).find('3') != string::npos)
+        {
+            count++;
+        }
+    }
+    cout <<count<<endl;
+    
     return 0;
 }