04 2021 档案

摘要：问题描述 我们把一个数称为有趣的，当且仅当： 1. 它的数字只包含0, 1, 2, 3，且这四个数字都出现过至少一次。 2. 所有的0都出现在所有的1之前，而所有的2都出现在所有的3之前。 3. 最高位数字不为0。 因此，符合我们定义的最小的有趣的数是2013。除此以外，4位的有趣的数还有两个：20 阅读全文

摘要：Problem Statement There is an image with a height of H pixels and a width of W pixels. Each of the pixels is represented by either . or *. The charact 阅读全文

摘要：Problem Statement There are N boxes arranged in a row. Initially, the i-th box from the left contains ai candies. Snuke can perform the following oper 阅读全文

摘要：Problem Statement You are given nonnegative integers a and b (a≤b), and a positive integer x. Among the integers between a and b, inclusive, how many 阅读全文

摘要：Problem Statement You are given a string S consisting of digits between 1 and 9, inclusive. You can insert the letter + into some of the positions (po 阅读全文

摘要：Problem Statement Alice, Bob and Charlie are playing Card Game for Three, as below: At first, each of the three players has a deck consisting of some 阅读全文

摘要：今天做了AtCoder Beginner Contest 044的C题： Problem Statement Tak has N cards. On the i-th (1≤i≤N) card is written an integer xi. He is selecting one or more 阅读全文