思路: 贪心乱搞. 实现: #include <bits/stdc++.h> using namespace std; typedef long long ll; const ll m = 1e13; ll a[], b[]; bool check(ll x) { ll s = sqrt(x); return s * s == x; } int main() { int n; while (cin >> n) { ; i <= n / ; i++) cin >>…

传送门:http://codeforces.com/contest/1081/problem/E E. Missing Numbers time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Chouti is working on a strange math problem. There was a sequence of nn …

Numeros, The Artist, had two lists A and B, such that, B was a permutation of A. Numeros was very proud of these lists. Unfortunately, while transporting them from one exhibition to another, some numbers from List A got left out. Can you find out the…

E. Missing Numbers 题目链接:https://codeforces.com/contest/1081/problem/E 题意: 现在有n个数(n为偶数),但只给出a2,a4....an的信息,要求你求出a1,a2....an. 假设前n项的和为Sn,那么满足S1,S2....Sn都为平方项. 题解: 假设S1=a^2,S2=b^2,S3=c^2,S4=d^2,因为我们已知a2,a4,所以得出a2=S2-S1=b^2-a^2,a4=d^2-c^2. 我们可以根据我们设的未知数推…

[本文链接] http://www.cnblogs.com/hellogiser/p/find-k-missing-numbers-from-1-to-n.html  [题目] 从1到n,共有n个数字(无序排列),每个数字只出现一次.现在随机拿走一个数字x,请给出最快的方法,找到这个数字.要求时间复杂度为O(n),空间复杂度为O(1).如果随机拿走k(k>=2)个数字呢? [分析] 题目给出的条件很强,数字是从1~n的数字,限制了数字的范围:每个数字只出现一次,限制了数字出现的次数:随即拿走了一…

原题链接在这里:https://leetcode.com/problems/missing-element-in-sorted-array/ 题目: Given a sorted array A of unique numbers, find the K-th missing number starting from the leftmost number of the array. Example 1: Input: A = [4,7,9,10], K = 1 Output: 5 Explan…

作者: 负雪明烛 id: fuxuemingzhu 个人博客:http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 遍历 日期 题目地址:https://leetcode-cn.com/problems/missing-element-in-sorted-array/ 题目描述 Given a sorted array A of unique numbers, find the K-th missing number starting from the leftmo…

据传说是MS/Google等等IT名企业的面试题: 有一组数字,从1到n,中减少了一个数,顺序也被打乱,放在一个n-1的数组里 请找出丢失的数字,最好能有程序,最好算法比较快 BTW1: 有很多种方法的哦,据说O(n)的方法就不止一种 BTW2: 扩展问题,如果丢失了2个数字呢? BTW3: 一定要小心不要溢出,嗯,面试者有时候不会提醒你的 BTW4: 最好不要多申请n多空间 Update 一个很相近的题目:1-1000放在含有1001个元素的数组中,只有唯一的一个元素值重复,其它均只出现一次.…

Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers. If such arrangement is not possible, it must rearrange it as the lowest possible order (ie, sorted in ascending order). The replaceme…

[Codeforces]817F. MEX Queries You are given a set of integer numbers, initially it is empty. You should perform n queries. There are three different types of queries: 1 l r — Add all missing numbers from the interval [l, r] 2 l r — Remove all present…