摘要: 链接: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=4454 题意: 输入整数n(1≤n≤30000000),有多少对整数(a,b)满足:1≤b≤a≤n 阅读全文
posted @ 2018-04-18 09:20 Ctfes 阅读(245) 评论(0) 推荐(0) 编辑