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Leetcode: Super Ugly Number
Write a program to find the nth super ugly number.Super ugly numbers are positive numbers whose all prime factors are in the given prime list primes o...
分类:其他好文   时间:2016-01-01 09:23:02    阅读次数:180
c++ 数组相关错误
leetcode-Count Primes遇到的数组问题http://bbs.csdn.net/topics/320232966 :函数里,如果是静态申请数组的话,都是在栈里申请,而栈的容量很小(已知int a[290000]会出错) 全...
分类:编程语言   时间:2015-12-30 13:43:14    阅读次数:170
313.Super Ugly Number
Write a program to find the nth super ugly number.Super ugly numbers are positive numbers whose all prime factors are in the given prime list primes o...
分类:其他好文   时间:2015-12-12 16:49:24    阅读次数:290
LeetCode() Super Ugly Number
用了优先队列,还是超时class Solution {public: int nthSuperUglyNumber(int n, vector& primes) { priority_queue,std::greater > pq; pq.push(1); int i=1; i...
分类:其他好文   时间:2015-12-07 15:49:09    阅读次数:135
UVA 1213 - Sum of Different Primes
类似一个背包问题的计数问题。(虽然我也不记得这叫什么背包了一开始我想的状态定义是:f[n = 和为n][k 个素数]。递推式呼之欲出: f[n][k] = sigma f[n-pi][k-1]。但是题目还有一个要求是不同素数之和,为了保证素数不同,那就先枚举素数吧,f[i][n][k] =sigma...
分类:其他好文   时间:2015-11-14 17:53:56    阅读次数:427
[LeetCode]54. Count Primes统计素数
Description:Count the number of prime numbers less than a non-negative number, n.Credits:Special thanks to @mithmatt for adding this problem and creat...
分类:其他好文   时间:2015-11-03 10:28:12    阅读次数:269
LeetCode OJ:Count Primes(质数计数)
Count the number of prime numbers less than a non-negative number,n.计算小于n的质数的个数,当然就要用到大名鼎鼎的筛法了,代码如下,写的有点乱不好意思。 1 class Solution { 2 public: 3 int ...
分类:其他好文   时间:2015-10-06 23:48:41    阅读次数:383
Project Euler 77:Prime summations
原题:Prime summationsIt is possible to write ten as the sum of primes in exactly five different ways:7 + 35 + 55 + 3 + 23 + 3 + 2 + 22 + 2 + 2 + 2 + 2Wh...
分类:其他好文   时间:2015-10-02 17:15:17    阅读次数:212
Inclusion–exclusion principle(动态规划)
QUESTION:把(2, 3, 5, 7)称为primes,能被primes整除的我们称之为Walprimes,比如-21, -30, 0, 5, 14 是, 而-121, 1, 143 etc不是Walprimes。现在给一个由数字组成的字符串,请在数字之间用+,或-,或什么符号都不用,来组成一...
分类:其他好文   时间:2015-09-28 11:33:12    阅读次数:286
Count Primes 解答
QuestionCount the number of prime numbers less than a non-negative number,n.Solution 1Naive way, to check each number one by one. If a number i is pri...
分类:其他好文   时间:2015-09-14 07:10:35    阅读次数:207
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