摘要： 原题链接 https://codeforces.ml/contest/1514/problem/B Baby Badawy's first words were "AND 0 SUM BIG", so he decided to solve the following problem. Given 阅读全文

摘要： 原题链接 https://codeforces.ml/contest/1514/problem/A Given an array a of length n, tell us whether it has a non-empty subsequence such that the product o 阅读全文

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摘要： 题目描述 小蓝要用七段码数码管来表示一种特殊的文字。 上图给出了七段码数码管的一个图示，数码管中一共有 7 段可以发光的二 极管，分别标记为 a, b, c, d, e, f, g。 小蓝要选择一部分二极管（至少要有一个）发光来表达字符。在设计字符的表达时，要求所有发光的二极管是连成一片的。 例如： 阅读全文

摘要： 题目描述 The National Road Service (NRS) wanted to make some changes to make sure that people are correctly ocially distancing from each other. However, N 阅读全文

摘要： 题目描述 Tax collectors in the Roman empire, called publicans, are not well perceived, and for good reason. However, they are necessary for the running of 阅读全文

摘要： 题目描述 Emma is a creative child who got bored during the quarantine season. She set up n trampolines in a line inside the living room, each aimed in a p 阅读全文

摘要： 题目描述 Listening to the rock music permutes your nuclear DNA. This astonishing and unbelievable fact was recently published in the Rock Nature Weekly, o 阅读全文

摘要： 题目描述 Boris is the chief executive officer of Rock Anywhere Transport (RAT) company which specializes in supporting music industry. In particular, they 阅读全文

摘要： 题目描述 Fernando was hired by the University of Waterloo to finish a development project the university started some time ago. Outside the campus, the un 阅读全文