添加了许多代码文件

2个数字的组合.cpp

@@ -0,0 +1,16 @@
+#include <iostream>
+#include <iomanip>
+#include <cstring>
+#include <cstdio>
+#include <ctime>
+using namespace std;
+int main(){
+	int a;
+	cin >>a;
+	for(int i=1;i<=a;i++){
+		for(int j=i+1;j<=a;j++){
+			cout <<i<<" "<<j<<endl; 
+		}
+	}
+	return 0;
+}