摘要:
http://codeforces.com/contest/682/problem/C dfs,没什么好说的,直接看代码吧 阅读全文
摘要:
http://codeforces.com/contest/682/problem/B 阅读全文
摘要:
http://codeforces.com/contest/682/problem/A 阅读全文
摘要:
http://codeforces.com/contest/500/problem/D https://blog.csdn.net/ShiAokai/article/details/42921885?locationNum=8&fps=1 阅读全文