摘要： Description In Berland recently a new collection of toys went on sale. This collection consists of 109 types of toys, numbered with integers from 1to  阅读全文

摘要： Description Maria participates in a bicycle race. The speedway takes place on the shores of Lake Lucerne, just repeating its contour. As you know, the 阅读全文

摘要： 中序遍历：左->根->右； 前序遍历：根->左->右； 后序遍历：左->右->根； 层序遍历：一层一层的来。。。。 通常给出中序遍历，在给出前/后序遍历，就能求出后/前遍历； 一、已知前序、中序遍历，求后序遍历 例： 前序遍历: GDAFEMHZ 中序遍历: ADEFGHMZ 画树求法：第一步，根据 阅读全文

摘要： Problem Description 电子科大本部食堂的饭卡有一种很诡异的设计，即在购买之前判断余额。如果购买一个商品之前，卡上的剩余金额大于或等于5元，就一定可以购买成功（即使购买后卡上余额为负），否则无法购买（即使金额足够）。所以大家都希望尽量使卡上的余额最少。某天，食堂中有n种菜出售，每种菜 阅读全文

摘要： Description Bessie has gone to the mall's jewelry store and spies a charm bracelet. Of course, she'd like to fill it with the best charms possible fro 阅读全文

摘要： Problem Description Many years ago , in Teddy’s hometown there was a man who was called “Bone Collector”. This man like to collect varies of bones , s 阅读全文

摘要： Problem Description The aspiring Roy the Robber has seen a lot of American movies, and knows that the bad guys usually gets caught in the end, often b 阅读全文

摘要： Problem Description Hiking in the mountains is seldom an easy task for most people, as it is extremely easy to get lost during the trip. Recently Gree 阅读全文

摘要： Problem Description Farmer John has been informed of the location of a fugitive cow and wants to catch her immediately. He starts at a point N (0 ≤ N 阅读全文

摘要： Problem Description You're in space.You want to get home.There are asteroids.You don't want to hit them. Input Input to this problem will consist of a 阅读全文