估计是因为洛谷判定你多打了个空格。。
by Thaumaturge @ 2019-03-11 19:47:23
```cpp
#include<iostream>
using namespace std;
int main()
{
int n;
cin>>n;
switch(n)
{
case 3:cout<<"1+2-3";break;
case 4:cout<<"1-2-3+4";break;
case 5:cout<<"1 2-3-4-5";break;
case 6:cout<<"1 2+3-4-5-6";break;
case 7:{
//cout<<""<<endl;
cout<<"1+2-3+4-5-6+7"<<endl;
cout<<"1+2-3-4+5+6-7"<<endl;
cout<<"1-2 3+4+5+6+7"<<endl;
cout<<"1-2 3-4 5+6 7"<<endl;
cout<<"1-2+3+4-5+6-7"<<endl;
cout<<"1-2-3-4-5+6+7"<<endl;
break;
}
case 8:
{
cout<<"1 2-3 4-5 6+7 8"<<endl;
cout<<"1+2 3-4 5+6+7+8"<<endl;
cout<<"1+2+3+4-5-6-7+8"<<endl;
cout<<"1+2+3-4+5-6+7-8"<<endl;
cout<<"1+2-3+4+5+6-7-8"<<endl;
cout<<"1+2-3-4-5-6+7+8"<<endl;
cout<<"1-2 3-4+5+6+7+8"<<endl;
cout<<"1-2+3-4-5+6-7+8"<<endl;
cout<<"1-2-3+4+5-6-7+8"<<endl;
cout<<"1-2-3+4-5+6+7-8"<<endl;
break;
}
case 9:
{
cout<<"1 2+3 4-5 6-7+8+9"<<endl;
cout<<"1 2+3+4-5-6-7+8-9"<<endl;
cout<<"1 2+3-4 5+6+7+8+9"<<endl;
cout<<"1 2+3-4+5-6+7-8-9"<<endl;
cout<<"1 2-3+4+5 6-7 8+9"<<endl;
cout<<"1 2-3+4+5+6-7-8-9"<<endl;
cout<<"1 2-3-4-5+6-7-8+9"<<endl;
cout<<"1 2-3-4-5-6+7+8-9"<<endl;
cout<<"1+2-3 4-5 6+7 8+9"<<endl;
cout<<"1-2 3-4-5 6-7+8 9"<<endl;
cout<<"1-2-3 4+5+6+7+8+9"<<endl;
break;
}
}
}//直接打表
```
by AK_CSP_is_easy @ 2021-11-14 10:31:06
n???
by 违规用户名DIEIE93J @ 2022-09-27 19:51:33