Uva 11728 - Alternate Task 题目链接 题意:给定一个因子和.求出相应是哪个数字 思路:数字不可能大于因子和,对于每一个数字去算出因子和,然后记录下来就可以 代码: #include <stdio.h> #include <string.h> const int N = 1005; int n, ans[N]; void init() { memset(ans, -1, sizeof(ans)); for (int i = 1; i <= 1000;…
Little Hasan loves to play number games with his friends. One day they were playing a game whereone of them will speak out a positive number and the others have to tell the sum of its factors. Thefirst one to say it correctly wins. After a while they…
题意:给定一个 n,求一个最大正整数 N 使得 N 的所有正因数和等于 n. 析:对于任何数一个 n,它的所有正因子都是大于等于本身的,因为 n 本身就是自己的正因数,这样的就可以直接暴力了,答案肯定是在 1 ~ n 范围内. 代码如下: #pragma comment(linker, "/STACK:1024000000,1024000000") #include <cstdio> #include <string> #include <cstdlib&…
Carmichael Numbers An important topic nowadays in computer science is cryptography. Some people even think that cryptography is the only important field in computer science, and that life would not matter at all without cryptography. Alvaro is one…
