原题指路:codeforces.com/problems 题意 将n个数a_1,\cdots,a_n分为大小分别为n_1,n_2的两集合,使得两集合的元素的算术平均值之和最大,误差不超过1\mathrm{e}-6. 第一行输入三个整数n,n_1,n_2\ \ (1\leq n,n_1,n_2\leq 1\mathrm{e}5,n_1+n_2\leq n).第二行输入n个整数a_1,\...
题单:codeforces.com/problems 17A. Noldbach problem 原题指路:codeforces.com/problems 题意(2 s) 给定两整数n,k (2≤n≤1000,0≤k≤1000),问[2,n]中是否至少有k个素数能表示为三个数之和,其中两个为相邻素数,第三个为1,若能,输出"YES";否则输出"NO". 思路 注意n范围小,可先筛出1000以内的素数...
Provide an array D = [d1, d2, d3, ... , dk] , such that d1 * d2 * d3 * ... * dk = N, di <= M, k should be minimized, or print impossible. =x-1;i>=0;i--){while(d<=%prime[i]==0){d*=prime[i];}if(d>M){cout<<d/prime[i]<<;}}...
int>#defineint long longintread(){intres=0,ch,flag=0;if((ch=getchar())=='-')//判断正负flag=1;elseif(ch>='0'&&ch<='9')//得到完整的数res=ch-'0';while((ch=getchar())>='0'&&ch<='9')
xy=ng−1xy=ng−1. now we need to find pair(x,y)(x,y)with the minimum difference such that their multiplication equals tong−1ng−1andxxandyyare coprime. We can simply iterate over the pairs of divisors ofng−1ng−1, check if they're coprime, and pick the one with the ...
codeforces 1325 E-Ehab's REAL Number Theory Problem 原题: E. Ehab's REAL Number Theory Problem 题意: 1.Every elementinthisarray has at most7divisors.2.从中挑出几个数,使得他们的乘积为完全平方数,问你最少要挑几个? 题解: Every element in this array has at most 7 divisors. ...
codeforces 1325 E-Ehab's REAL Number Theory Problem codeforces 1325 E-Ehab’s REAL Number Theory Problem 原题: E. Ehab’s REAL Number Theory Problem 题意: 1. Every element in this array has at most 7 divisors. 2. 从中挑出几个数,使得他们的乘积为完全平方数,问你最少要挑几个? 题解:...
Educational Codeforces Round 78 (Rated for Div. 2) 2019-12-20 20:49 − ## [A. Shuffle Hashing (CF 1278 A)](https://codeforces.com/contest/1278/problem/A) ### 题目大意给定两个字符串$a,b$,现改变$a$串中的字母顺序,问是否存在某种顺序在$b$串中出现。 ### 解题思路先对$a... ...
codeforces E. Array Shrinking 题目 题意: 给你一组序列,序列中相邻的两个一样的值可以合并成一个值+1的数,问最后剩下的最少的元素有多少个。 思路: 本来我的思路是用栈或者队列的方式去合并,然后输出元素的个数,但是发现假如1 1 1 2这样的如果用那种方法会变成2 1 2但是最少的应该是1 3所以要用...
原题指路:codeforces.com/problems 题意 给定两个分数\dfrac{a}{b}和\dfrac{c}{d}.现有操作:选定一个整数x,将一个分数的分子或分母乘x(分母不能乘0).问使得两分数相等所需的最小步数. 有t\ \ (1\leq t\leq 1\mathrm{e}4)组测试数据.每组测试数据输入四个整数a,b,c,d\ \ (0\leq a,c\leq...