【C++快读快写】

算法竞赛中用于解决卡常问题

int rd(){int k = 0;char c = getchar();while(!isdigit(c)){c = getchar();}while(isdigit(c)){k= (k << 1) + (k << 3) + (c^'0'), c = getchar();}return k;
}void wr(int x)
{if (x > 9)wr(x / 10);putchar((x % 10) ^ '0');
}

用法：
假如读取(int) a
int a = rd();