• 快读

inline int read()//快读 
{
    register int x = 0, t = 1;
    register char ch = getchar();
    while(ch < '0' || ch > '9'){if(ch == '-') t = -1;ch = getchar();}
    while(ch >= '0' && ch <= '9'){x = (x << 1) + (x << 3) + (ch ^ 48);ch = getchar();}
    return x * t;
}

• 快写

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