输入输出优化技巧

void re(int &x)

{

x = 0; char s = getchar();

while(s < '0' || s > '9') s = getchar();

while(s >= '0' && s <= '9') { x = x * 10 + s - '0'; s = getchar();}

}

void wr(int x)

{

if(x >9) wr(x/10);

putchar(x%10+'0');

}

inline int read()

{

int ret = 0, w = 1;

char ch = getchar();

while(ch <= '0' || ch >= '9')

{

if(ch == '-')

w = -1;

ch = getchar();

}

while(ch >= '0' && ch <= '9')

ret = ret * 10 + ch - '0', ch = getchar();

return ret * w;

}

inline void write(int x)

{

if(x < 0)

putchar('-'), x = -x;

if(x > 9)

write(x / 10);

putchar(x % 10 + '0');

}

不仅没什么卵用 还会让你超时