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You are given n segments on a line. There are no ends of some segments that coincide. For each segment find the number of segments it contains. You ar 阅读全文
摘要：
Jimmy writes down the decimal representations of all natural numbers between and including m and n, (m ≤ n). How many zeroes will he write down? Input 阅读全文
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An integer is divisible by 3 if the sum of its digits is also divisible by 3. For example, 3702 is divisible by 3 and 12 (3+7+0+2) is also divisible b 阅读全文
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Problem Description A wqb-number, or B-number for short, is a non-negative integer whose decimal form contains the sub- string "13" and can be divided 阅读全文