Prime Distance Time Limit: 2 Seconds Memory Limit: 65536 KB The branch of mathematics called number theory is about properties of numbers. One of the areas that has captured the interest of number theoreticians for thousands of years is the ques…
Semi-prime H-numbers Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 8216 Accepted: 3556 Description This problem is based on an exercise of David Hilbert, who pedagogically suggested that one study the theory of 4n+1 numbers. Here, we…
Prime Path The ministers of the cabinet were quite upset by the message from the Chief of Security stating that they would all have to change the four-digit room numbers on their offices. — It is a matter of security to change such things every now a…
Prime Distance Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 9944 Accepted: 2677 Description The branch of mathematics called number theory is about properties of numbers. One of the areas that has captured the interest of number the…
http://poj.org/problem?id=2262 Goldbach's Conjecture Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 34323 Accepted: 13169 Description In 1742, Christian Goldbach, a German amateur mathematician, sent a letter to Leonhard Euler in whic…
Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 9519 Accepted: 5458 Description The ministers of the cabinet were quite upset by the message from the Chief of Security stating that they would all have to change the four-digit room numb…
Semi-prime H-numbers Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 7059 Accepted: 3030 Description This problem is based on an exercise of David Hilbert, who pedagogically suggested that one study the theory of 4n+1 numbers. Here, we…
题目链接: http://poj.org/problem?id=2771 Description Frank N. Stein is a very conservative high-school teacher. He wants to take some of his students on an excursion, but he is afraid that some of them might become couples. While you can never exclude th…
This problem is based on an exercise of David Hilbert, who pedagogically suggested that one study the theory of 4n+1 numbers. Here, we do only a bit of that. An H-number is a positive number which is one more than a multiple of four: 1, 5, 9, 13, 17,…
Prime Path Time Limit: 1000MS Memory Limit: 65536KB 64bit IO Format: %I64d & %I64u Submit Status Description The ministers of the cabinet were quite upset by the message from the Chief of Security stating that they would all have to change the fo…
The ministers of the cabinet were quite upset by the message from the Chief of Security stating that they would all have to change the four-digit room numbers on their offices.- It is a matter of security to change such things every now and then, to…
18.1 Write a function that adds two numbers. You should not use + or any arithmetic operators. 这道题让我们实现两数相加,但是不能用加号或者其他什么数学运算符号,那么我们只能回归计算机运算的本质,位操作Bit Manipulation,我们在做加法运算的时候,每位相加之后可能会有进位Carry产生,然后在下一位计算时需要加上进位一起运算,那么我们能不能将两部分拆开呢,我们来看一个例子759+674 1.…
类似素数筛... Semi-prime H-numbers Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 6873 Accepted: 2931 Description This problem is based on an exercise of David Hilbert, who pedagogically suggested that one study the theory of 4n+1 numbers. Her…
题目 丑数 设计一个算法,找出只含素因子3,5,7 的第 k 大的数. 符合条件的数如:3,5,7,9,15...... 样例 如果k=4, 返回 9 挑战 要求时间复杂度为O(nlogn)或者O(n) 解题 法一:直接暴力,逐次判断一个数是不是丑数 下面只对其中的奇数判断是否是丑数,加不加奇数都超时. class Solution { /** * @param k: The number k. * @return: The kth prime number as description. */…
Problem Description Everybody knows any number can be combined by the prime number. Now, your task is telling me what position of the largest prime factor. The position of prime 2 is 1, prime 3 is 2, and prime 5 is 3, etc. Specially, LPF(1) = 0. Inpu…
