read函數和write函數

read 函數

 1 inline int read() 
 2 {
 3     int x=0;
 4     bool f=1;
 5     char c=getchar();
 6     for(; !isdigit(c); c=getchar()) if(c=='-') f=0;
 7     for(; isdigit(c); c=getchar()) x=(x<<3)+(x<<1)+c-'0';
 8     if(f) return x;
 9     return 0-x;
10 }

write 函數

1 inline void write(int x)
2 {
3     if(x<0){putchar('-');x=-x;}
4     if(x>9)write(x/10);
5     putchar(x%10+'0');
6 }