输入输出外挂

 1 //仅适合纯数字输入
 2 int Scan()     //输入外挂
 3 {
 4     int res=0,ch,flag=0;
 5     if((ch=getchar())=='-')
 6         flag=1;
 7     else if(ch>='0'&&ch<='9')
 8         res=ch-'0';
 9     while((ch=getchar())>='0'&&ch<='9')
10         res=res*10+ch-'0';
11     return flag?-res:res;
12 }
13 void Out(int a)    //输出外挂
14 {
15     if(a>9)
16         Out(a/10);
17     putchar(a%10+'0');
18 }