1 inline int read(int &x) 2 { 3     int k=0; 4     char f=1; 5     char c=getchar(); 6     while(c>'9'||c<'0') 7         if(c=='-') 8         { 9             f=-1;10             c=getchar();11         }12     while(c<='9'&&c>='0')13     {14         k=k*10+c-'0';15         c=getchar();16     }17     x = k*f;18 }