int read(){ int s = 0, f = 0; char ch = getchar(); while(!isdigit(ch)) f |= (ch == '-'), ch = getchar(); while(isdigit(ch)) s = (s << 1) + (s << 3) + ch - '0' , ch = getchar(); return f ? -s : s; }
没错，只有一个板子
Update20210102：板子写错了