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链接：https://ac.nowcoder.com/acm/contest/549/C来源：牛客网 题目描述 小A最近开始沉迷买彩票，并且希望能够通过买彩票发家致富。已知购买一张彩票需要3元，而彩票中奖的金额分别为1,2,3,4元，并且比较独特的是这个彩票中奖的各种金额都是等可能的。现在小A连续购 阅读全文
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Dreamoon likes coloring cells very much. There is a row of nn cells. Initially, all cells are empty (don't contain any color). Cells are numbered from 阅读全文
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The sequence of mm integers is called the permutation if it contains all integers from 11 to mm exactly once. The number mm is called the length of th 阅读全文
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Dreamoon is a big fan of the Codeforces contests. One day, he claimed that he will collect all the places from 11 to 5454 after two more rated contest 阅读全文
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题目描述 Farmer John has installed a new system of N−1N-1N−1 pipes to transport milk between the NNN stalls in his barn (2≤N≤50,0002 \leq N \leq 50,0002≤N 阅读全文
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Yixght is a manager of the company called SzqNetwork(SN). Now she's very worried because she has just received a bad news which denotes that DxtNetwor 阅读全文
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You may have heard that no two snowflakes are alike. Your task is to write a program to determine whether this is really true. Your program will read 阅读全文
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Word ss of length nn is called kk -complete if ss is a palindrome, i.e. si=sn+1−isi=sn+1−i for all 1≤i≤n1≤i≤n ; ss has a period of kk , i.e. si=sk+isi 阅读全文
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A positive integer is called composite if it can be represented as a product of two positive integers, both greater than 11 . For example, the followi 阅读全文
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Alice has a cute cat. To keep her cat fit, Alice wants to design an exercising walk for her cat! Initially, Alice's cat is located in a cell (x,y)(x,y 阅读全文