天空不再阴霾:
博客地址:https://www.cnblogs.com/violentbear/
D. Armchairs(Educational Codeforces Round 109 (Rated for Div. 2)题解) C. Nastia and a Hidden Permutation(Codeforces Round #720 (Div. 2)题解)
D. Armchairs(Educational Codeforces Round 109 (Rated for Div. 2)题解)
C. Nastia and a Hidden Permutation(Codeforces Round #720 (Div. 2)题解)