摘要： http://acm.hdu.edu.cn/search.php?field=problem&key=2015ACM%2FICPC%D1%C7%D6%DE%C7%F8%C9%F2%D1%F4%D5%BE-%D6%D8%CF%D6%C8%FC%A3%A8%B8%D0%D0%BB%B6%AB%B1%B1... 阅读全文