A Count Task Problem Description Count is one of WNJXYK's favorite tasks. Recently, he had a very long string and he wondered that how many substrings which contains exactly one kind of lowercase in this long string. But this string is so long that h…
素数判断2 比较简单的算法,没有技术含量 A prime number is a natural number which has exactly two distinct natural number divisors: 1 and itself. For example, the first four prime numbers are: 2, 3, 5 and 7. Write a program which reads a list of N integers and prints th…
练习题目二 素数判断 A prime number is a natural number which has exactly two distinct natural number divisors: 1 and itself. For example, the first four prime numbers are: 2, 3, 5 and 7. Write a program which reads a list of N integers and prints the number o…
近来刚学JAVA,就从JAVA写起吧,JAVA判别素数,其实方法和C/C++没什么区别,主要就是想谈一下,其中包括的3个点. (1)JAVA语言产生随机数,random函数,定义参数max的作用是给出最大随机数的生成范围,当然也可以产生一组随机数,定义数组mat[],在random中定义int n, int max,n代表生成数组里有几个随机数,max还是生成范围. (2)素数判断.1,2,是素数,给出单独的判断.生成随机数后,根据素数定义,除了1和本事之外没有别的除数,所以从2开始到int…
Problem about GCD Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 470 Accepted Submission(s): 77 Problem Description Given integer m. Find multiplication of all 1<=a<=m such gcd(a, m)=1 (cop…
Problem Description Writea program to read in a list of integers and determine whether or not eachnumber is prime. A number, n, is prime if its only divisors are 1 and n. Forthis problem, the numbers 1 and 2 are not considered primes. Input Eachinput…
A - Serval and Bus It is raining heavily. But this is the first day for Serval, who just became 3 years old, to go to the kindergarten. Unfortunately, he lives far from kindergarten, and his father is too busy to drive him there. The only choice for…
原题链接:http://poj.org/problem?id=2429 GCD & LCM Inverse Time Limit: 2000MS Memory Limit: 65536K Total Submissions: 17639 Accepted: 3237 Description Given two positive integers a and b, we can easily calculate the greatest common divisor (GCD) and the l…
浅入动态规划 dynamic programming is a method for solving a complex problem by breaking it down into a collection of simpler subproblems. 最近进行动态规划的学习,看到了一个很好的例子,现在把它记录下来仅供自我知识梳理 1. 从一个生活问题谈起 作者:阮行止 先来看看生活中经常遇到的事吧--假设您是个土豪,身上带了足够的1.5.10.20.50.100元面值的钞票.现在您的目…
1015 Reversible Primes (20 分) A reversible prime in any number system is a prime whose "reverse" in that number system is also a prime. For example in the decimal system 73 is a reversible prime because its reverse 37 is also a prime. Now give…
W - Prime Time 题意:用公式n*n+n+41,判断素数的百分比 #include<iostream> #include<algorithm> #include<math.h> #include<string.h> #include<string> #define ll long long #define mx 10000100 using namespace std; ]; bool isprime(int x)//快速判断素数 {…
题目 A reversible prime in any number system is a prime whose "reverse" in that number system is also a prime. For example in the decimal system 73 is a reversible prime because its reverse 37 is also a prime. Now given any two positive integers N…