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You are given three strings aa , bb and cc of the same length nn . The strings consist of lowercase English letters only. The ii -th letter of aa is a 阅读全文
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Polycarp wants to assemble his own keyboard. Layouts with multiple rows are too complicated for him — his keyboard will consist of only one row, where 阅读全文
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Your company was appointed to lay new asphalt on the highway of length nn. You know that every day you can either repair one unit of the highway (lay 阅读全文
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You are given a string ss. Each character is either 0 or 1. You want all 1's in the string to form a contiguous subsegment. For example, if the string 阅读全文
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An ascending sorted sequence of distinct values is one in which some form of a less-than operator is used to order the elements from smallest to large 阅读全文
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题目描述 CC C国有n n n个大城市和m mm 条道路，每条道路连接这 nnn个城市中的某两个城市。任意两个城市之间最多只有一条道路直接相连。这 mmm 条道路中有一部分为单向通行的道路，一部分为双向通行的道路，双向通行的道路在统计条数时也计为 11 1条。 CC C国幅员辽阔，各地的资源分布情 阅读全文
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Bessie is out in the field and wants to get back to the barn to get as much sleep as possible before Farmer John wakes her for the morning milking. Be 阅读全文
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Farmer John wants to set up a telephone line at his farm. Unfortunately, the phone company is uncooperative, so he needs to pay for some of the cables 阅读全文
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Guy-Manuel and Thomas have an array aa of nn integers [a1,a2,…,an ]. In one step they can add 11 to any element of the array. Formally, in one step th 阅读全文
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Anu has created her own function ff : f(x,y)=(x|y)−y where || denotes the bitwise OR operation. For example, f(11,6)=(11|6)−6=15−6=9. It can be proved 阅读全文