传送门:http://acm.hdu.edu.cn/showproblem.php?pid=6464 免费送气球 Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 264 Accepted Submission(s): 53 Problem Description 又到了GDUT一年一度的程序设计竞赛校赛的时间啦.同学们只要参加校赛,…
简单数学题 Time Limit: 4000/2000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 580 Accepted Submission(s): 257 Problem Description 已知 F(n)=∑i=1n(i×∑j=inCij) 求 F(n) mod 1000000007 Input 多组输入,每组输入占一行,包含一个整数n(1 <= n <…