题目链接http://codeforces.com/gym/101606题目High-rise buildings in the wealthy retail district of Knightsbridge are usually built with exotic hoisting machines known, in construction circles, as cranes.W...
题目链接http://acm.hdu.edu.cn/showproblem.php?pid=6393题目Problem DescriptionChika is elected mayor of Numazu. She needs to manage the traffic in this city. To manage the traffic is too hard for her. So ...
题目链接：http://exam.upc.edu.cn/problem.php?id=5120题目：题目描述Open-pit mining is a surface mining technique of extracting rock or minerals from the earth by their removal from an open pit or borrow. Open-p...
题目链接：http://exam.upc.edu.cn/problem.php?id=5211题目：题目描述In this problem, we would like to talk about unreachable sets of a directed acyclic graph G = (V, E). In mathematics a directed acyclic graph (...