摘要：
Description After their royal wedding, Jiajia and Wind hid away in XX Village, to enjoy their ordinary happy life. People in XX Village lived in beaut 阅读全文
摘要：
Problem Description The ALPC company is now working on his own network system, which is connecting all N ALPC department. To economize on spending, th 阅读全文
摘要：
LCA 题意：给一个无根树，有q个询问，每个询问3个点，问将这3个点连起来，距离最短是多少， LCA的模板题，分别求LCA(X,Y),LCA(X,Z),LCA(Y,Z)， 和对应的距离，然后3个距离相加再除以2就是这个询问的结果 阅读全文
摘要：
Problem Description After World War X, a lot of cities have been seriously damaged, and we need to rebuild those cities. However, some materials neede 阅读全文
摘要：
How far away ？ Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 22976 Accepted Submission(s): 9078 阅读全文