原始来源：https://www.cnblogs.com/tudouuuuu/p/14091196.html经过lhx和PeppaEvenPig改动优化而成；#defineFI(n)FastIO::read(n)#defineFO(n)FastIO::write(n)#defineFlushFastIO::Fflush()namespaceFastIO{constintSIZE=1<<16;charbuf[SIZE],obu