快读快写

快读

int read(){
    int x=0,f=1;
    char c=getchar();
    while(c<'0'||c>'9')
    {
        if(c=='-') 
            f=-1;
        c=getchar();
    }
    while(c>='0'&&c<='9') x=x*10+c-'0',c=getchar();
    return x*f;
} 

快写

oid write(int x)
{
    if(x<0) putchar('-'),x=-x;
    if(x>9) write(x/10);
    putchar(x%10+'0');
}