题目链接 题意 :给你一个n,让你找出小于等于n的数中因子个数最多的那个数,并且输出因子个数,如果有多个答案,输出数最小的那个 思路 : 官方题解 : (1)此题最容易想到的是穷举,但是肯定超时. (2)我们可以知道,计算约数的个数和质因数分解有着很大的联系: 若Q的质因数分解为:Q=p1^k1*p2^k2*…*pm^km(p1…pm为素数,k1…km≥1),则Q有(k1+1)(k2+1)…(km+1)个约数.但是质因数分解的时间复杂度很高,所以也会超时. (3)通过以上的公式,我们可以“突发奇…

题目链接:https://vjudge.net/problem/11177 题目大意: 求小于等于 n 的最大反素数. 分析: n <= 10^18,而前20个素数的乘积早超过10^18,因此可手动打素数表,再dfs寻找最大反素数. 代码如下: #pragma GCC optimize("Ofast") #include <bits/stdc++.h> using namespace std; #define INIT() std::ios::sync_with_st…

题目:http://acm.timus.ru/problem.aspx?space=1&num=1748 题意:求n范围内约数个数最多的那个数. Roughly speaking, for a number to be highly composite it has to have prime factors as small as possible, but not too many of the same. If we decompose a number n in prime factor…

E. Number With The Given Amount Of Divisors time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Given the number n, find the smallest positive integer which has exactly n divisors. It is guara…

1060 最复杂的数 题目来源: Ural 1748 基准时间限制:1 秒 空间限制:131072 KB 分值: 40 难度:4级算法题 把一个数的约数个数定义为该数的复杂程度,给出一个n,求1-n中复杂程度最高的那个数.   例如:12的约数为:1 2 3 4 6 12,共6个数,所以12的复杂程度是6.如果有多个数复杂度相等,输出最小的. Input 第1行:一个数T,表示后面用作输入测试的数的数量.(1 <= T <= 100) 第2 - T + 1行:T个数,表示需要计算的n.(1 &…

Time Limit: 5000MS Memory Limit: 131072K Case Time Limit: 2000MS Description N children are sitting in a circle to play a game. The children are numbered from 1 to N in clockwise order. Each of them has a card with a non-zero integer on it in his/her…

Who Gets the Most Candies? Time Limit:5000MS     Memory Limit:131072KB     64bit IO Format:%I64d & %I64u Submit Status Description N children are sitting in a circle to play a game. The children are numbered from 1 to N in clockwise order. Each of th…

1748 反素数 素数的个数随大小的递增而递减 可以相同 注意各种超啊 #include <iostream> #include<cstdio> #include<cstring> #include<algorithm> #include<stdlib.h> #include<cmath> using namespace std; #define INF 1e19 #define LL unsigned long long #defi…

CodeForces - 27E Number With The Given Amount Of Divisors Submit Status Description Given the number n, find the smallest positive integer which has exactly n divisors. It is guaranteed that for the given n the answer will not exceed 1018. Input The…

Description N children are sitting in a circle to play a game. The children are numbered from 1 to N in clockwise order. Each of them has a card with a non-zero integer on it in his/her hand. The game starts from the K-th child, who tells all the oth…