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LeetCode Count Primes
Description:Count the number of prime numbers less than a non-negative number,nclick to show more hints.References:How Many Primes Are There?Sieve of ...
分类:其他好文   时间:2015-04-30 12:05:00    阅读次数:102
leetcode-countPrimes
题目描述 Description: Count the number of prime numbers less than a non-negative number, n 题目分析 本题求小于n(n为大于零的数)的质数个数。 方法一 int countPrimes1(int n) { int count=0; bool flag=1; for (int i=2;...
分类:其他好文   时间:2015-04-29 21:56:02    阅读次数:157
LeetCode OJ Count Primes
Description: Count the number of prime numbers less than a non-negative number, n click to show more hints. Credits: Special thanks to @mithmatt for adding this problem and creating all te...
分类:其他好文   时间:2015-04-29 13:42:50    阅读次数:123
杭电1003(Max Sum) 首次dp
点击打开杭电1003 Problem Description Given a sequence a[1],a[2],a[3]......a[n], your job is to calculate the max sum of a sub-sequence. For example, given (6,-1,5,4,-7), the max sum in this sequence i...
分类:其他好文   时间:2015-04-29 11:46:20    阅读次数:118
[LeetCode]Count Primes
Description: Count the number of prime numbers less than a non-negative number, n click to show more hints. References: How Many Primes Are There? Sieve of Eratosthenes Credits: Speci...
分类:其他好文   时间:2015-04-29 10:06:42    阅读次数:134
leetcode : Count Primes
Description: Count the number of prime numbers less than a non-negative number, n [思路] 素数不能被比它小的整数整除, 建一个boolean 数组, 从2开始, 把其倍数小于N的都删掉. 注意 inner loop从i开始, 比i小的会在以前就被check过. [CODE] pu...
分类:其他好文   时间:2015-04-29 08:43:31    阅读次数:95
[LeetCode 204] Count Primes
题目链接:count-primes Description: Count the number of prime numbers less than a non-negative number, n public class Solution { public int countPrimes(int n) { if(n <= 2) return 0; Lis...
分类:其他好文   时间:2015-04-28 23:02:38    阅读次数:225
【数学】Count Primes
题目:leetcode Count Primes Description: Count the number of prime numbers less than a non-negative number, n 分析: 求出比n小的素数的个数,这个问题可以用排除法做,参考http://www.cnblogs.com/grandyang/p/4462810.html ...
分类:其他好文   时间:2015-04-28 23:01:22    阅读次数:287
[水+整数分解] poj 1365 Prime Land
题意: 给2*n个数,输入的这些数构成 sum=(a[1]^b[1])*(a[2]^b[2])... 其实就是整数分解完的数。 然后让你输出分解sum-1的结果。 从大到小。 思路: 就是输入麻烦点。 注意题目说了1的时候要输出空行。 代码: #include"cstdlib" #include"cstdio" #include"cstring" #include"cmath" ...
分类:其他好文   时间:2015-04-28 22:58:36    阅读次数:132
[水+dfs] poj 2034 Anti-prime Sequences
题意: 给n,m,k。 排列n~m之间的所有数。 保证相邻的2~k位之和均不为素数。 思路: 直接DFS。 代码: #include"cstdlib" #include"cstdio" #include"cstring" #include"cmath" #include"queue" #include"algorithm" #include"iostream" #include"...
分类:其他好文   时间:2015-04-28 22:56:01    阅读次数:209
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