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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
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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
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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
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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