題目鏈接:http://community.topcoder.com/stat?c=problem_statement&pm=13628&rd=16278

題目鏈接:http://codeforces.com/contest/501/problem/D

題目鏈接:http://community.topcoder.com/stat?c=problem_statement&pm=13349&rd=16277

題目鏈接:http://community.topcoder.com/stat?c=problem_statement&pm=13602&rd=16277

題目鏈接:http://www.codechef.com/problems/CLPERM/

题目链接:http://codeforces.com/contest/501/problem/C

題目鏈接:http://www.codechef.com/problems/ANUMLA

題目鏈接:http://www.codechef.com/problems/POUR1

題目鏈接:http://www.codechef.com/problems/ARRAYTRM

題目鏈接:暫時沒有

題目鏈接:http://www.lydsy.com/JudgeOnline/problem.php?id=1004

題目鏈接:http://codeforces.com/contest/500/problem/D

題目鏈接:http://codeforces.com/contest/500/problem/C

題目鏈接:http://acm.hdu.edu.cn/showproblem.php?pid=5155