题目链接：http://exam.upc.edu.cn/problem.php?id=5122题目：题目描述Mapping applications often represent the boundaries of countries, cities, etc. as polylines, which are connected sequences of line segments. Si...
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=5431题目：题目描述The Barareh village is on fire due to the attack of the virtual enemy. Several places are already on fire and the fire is spreading fast to oth...
题目链接：http://exam.upc.edu.cn/problem.php?id=5434题目：题目描述A multi-digit column addition is a formula on adding two integers written like this:A multi-digit column addition is written on the blackboard,...