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Description A game-board consists of N fields placed around a circle. Fields are successively numbered from1 to N clockwise. In some fields there may 阅读全文
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In one well-known algorithm of finding the k-th order statistics we should divide all elements into groups of five consecutive elements and find the m 阅读全文
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Petya and Gena love playing table tennis. A single match is played according to the following rules: a match consists of multiple sets, each set consi 阅读全文
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ATMs of a well-known bank of a small country are arranged so that they can not give any amount of money requested by the user. Due to the limited size 阅读全文
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Simon has an array a1, a2, ..., an, consisting of n positive integers. Today Simon asked you to find a pair of integers l, r (1 ≤ l ≤ r ≤ n), such tha 阅读全文
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We all know the impressive story of Robin Hood. Robin Hood uses his archery skills and his wits to steal the money from rich, and return it to the poo 阅读全文
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Alice thinks an integer x is a K-wolf number, if every K adjacent digits in decimal representation of x is pairwised different. Given (L,R,K), please 阅读全文
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windy定义了一种windy数。 不含前导零且相邻两个数字之差至少为22 的正整数被称为windy数。 windy想知道，在AA 和BB 之间，包括AA 和BB ，总共有多少个windy数？ Input 包含两个整数，AA BB 。 满足 1≤A≤B≤20000000001≤A≤B≤2000000 阅读全文
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A palindromic number or numeral palindrome is a 'symmetrical' number like 16461 that remains the same when its digits are reversed. In this problem yo 阅读全文
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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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A bit is a binary digit, taking a logical value of either 1 or 0 (also referred to as "true" or "false" respectively). And every decimal number has a 阅读全文
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For a number,if the length of continuous odd digits is even and the length of continuous even digits is odd,we call it odd-even number.Now we want to 阅读全文
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Volodya is an odd boy and his taste is strange as well. It seems to him that a positive integer number is beautiful if and only if it is divisible by 阅读全文
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A balanced number is a non-negative integer that can be balanced if a pivot is placed at some digit. More specifically, imagine each digit as a box wi 阅读全文
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The counter-terrorists found a time bomb in the dust. But this time the terrorists improve on the time bomb. The number sequence of the time bomb coun 阅读全文