摘要：什么都不会只能学数论QAQ 英文原题不贴了 题意： 有一张N*M的表格，i行j列的元素是gcd(i,j)读入一个长度为k，元素大小不超过10^12的序列a[1..k]，问这个序列是否在表格的某一行中出现过 1<=N,M<=10^121<=k<=10^4 恩 首先显然x=lcm(a[i]) 然后(y+ 阅读全文

摘要：cf劲啊 原题： We have a string of letters 'a' and 'b'. We want to perform some operations on it. On each step we choose one of substrings "ab" in the strin 阅读全文

摘要：…… 原题： Something happened in Uzhlyandia again... There are riots on the streets... Famous Uzhlyandian superheroes Shean the Sheep and Stas the Giraffe 阅读全文

摘要：好题 原题： There are k sensors located in the rectangular room of size n × m meters. The i-th sensor is located at point (xi, yi). All sensors are located 阅读全文

摘要：Problem 2. Fruit Feast 很简单的智商题（因为碰巧脑出来了所以简单一，一 原题： Bessie has broken into Farmer John's house again! She has discovered a pile of lemons and a pile of 阅读全文