摘要：
Problem DescriptionA thief is running away!We can consider the city where he locates as an undirected graph in which nodes stand for crosses and edges... 阅读全文
摘要：
DescriptionThere are N cities in a country, and there is one and only one simple path between each pair of cities. A merchant has chosen some paths an... 阅读全文
摘要：
DescriptionThe cows have run out of hay, a horrible event that must be remedied immediately. Bessie intends to visit the other farms to survey their h... 阅读全文