C. Nastya Is Transposing Matrices time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Nastya came to her informatics lesson, and her teacher who is, by the way, a little bit famous here gave he…
题意:给出两个n*m的矩阵,每次操作可以让一个正方形矩阵行列交换.问,在无限次操作下,第一个矩阵能否变成第二个矩阵 分析:先把操作限定在2*2的矩阵中.这样对角线上的元素就可以随意交换.也就是说,如果给相邻的元素随意的交换次数,那么一个长度为n的数列可以得到任何顺序. 然后把操作放大,发现不在一个对角线上的元素无论如何也是无法交换位置的. ac代码: #include<bits/stdc++.h> using namespace std; const int maxn=505; int num…
链接:https://codeforces.com/contest/1136/ A - Nastya Is Reading a Book - [二分] #include<bits/stdc++.h> using namespace std; ; int n,l[maxn],r[maxn],k; int srch(int x) { , R=n; while(L<R) { ; if(l[M]<=x && x<=r[M]) return M; ; ; } retur…
Codeforces Round #546 (Div. 2) 题目链接:https://codeforces.com/contest/1136 A. Nastya Is Reading a Book 题意: 一本书有n个章节,之后给出每个章节所在页数范围,然后有一个人来看书看了k页,问还有多少章节没看. 题解: 水题.模拟一下就好了. #include <bits/stdc++.h> using namespace std; typedef long long ll; ; int n; int…
题目地址:https://codeforces.com/contest/1136 A: Nastya Is Reading a Book 题解:挨个判断即可,水题. 参考代码: #include<bits/stdc++.h> using namespace std; ],r[],k; int main() { scanf("%d",&n); ;i<=n;++i) scanf("%d%d",&l[i],&r[i]); scan…
题目描述: This time, you are supposed to find A+B where A and B are two matrices, and then count the number of zero rows and columns. 输入: The input consists of several test cases, each starts with a pair of positive integers M and N (≤10) which are the n…
Matrices and Vectors Matrices are 2-dimensional arrays: A vector is a matrix with one column and many rows:The above matrix has four rows and three columns, so it is a 4 x 3 matrix. Notation and terms:So vectors are a subset of matrices. The above ve…
目录 Nystorm method 低秩逼近 矩阵乘法的逼近 Belabbas M A, Wolfe P J. Fast Low-Rank Approximation for Covariance Matrices[C]. IEEE International Workshop on Computational Advances in Multi-Sensor Adaptive Processing, 2007: 293-296. Nystorm method 和在WIKI看到的不是同一个东西?…
At the big break Nastya came to the school dining room. There are nn pupils in the school, numbered from 11 to nn. Unfortunately, Nastya came pretty late, so that all pupils had already stood in the queue, i.e. Nastya took the last place in the queue…
目录 问题 算法 LINEARTIMESVD 算法 CONSTANTTIMESVD 算法 理论 算法1的理论 算法2 的理论 代码 Drineas P, Kannan R, Mahoney M W, et al. Fast Monte Carlo Algorithms for Matrices II: Computing a Low-Rank Approximation to a Matrix[J]. SIAM Journal on Computing, 2006, 36(1): 158-183…
挺神仙的置换题 SP422 TRANSP2 - Transposing is Even More Fun 这个博客除了开始举例子别的都是对的: https://blog.csdn.net/BraketBN/article/details/50668414 首先理解题意: 就是单纯的矩阵转置,一行一行存储. (全部下标从0开始) 一个位置(i,j)在转置后会变成(j,i) 原来存储的位置是(下标从0开始):i*2^b+j 现在是:j*2^a+i 发现其实就是一个二进制数循环右移b位得到的 向要到的…
[SPOJ419]Transposing is Fun 题意:给你一个$2^a\times2^b$的矩阵,将$1...n$中的数依次从左到右,从上往下填到矩阵里,再把矩阵转置,然后把所有数从左到右,从上往下拿出来得到一个新的排列$A$.你现在每次可以交换两个数,问你从$1...n$变成排列$A$最少要进行多少次操作. 询问次数$\le400000,a+b\le 10^6$ 题解:首先我们可以找到所有的循环节,如果一个循环节中有$x$个数,需要交换$x-1$次.所以我们只需要求出循环节的个数$k$…
题目1001:A+B for Matrices 时间限制:1 秒内存限制:32 兆 题目描述: This time, you are supposed to find A+B where A and B are two matrices, and then count the number of zero rows and columns. 输入: The input consists of several test cases, each starts with a pair of posit…
题目1001:A+B for Matrices 时间限制:1 秒 内存限制:32 兆 特殊判题:否 提交:15235 解决:6172 题目描述: This time, you are supposed to find A+B where A and B are two matrices, and then count the number of zero rows and columns. 输入: The input consists of several test cases, each st…
Diag:Diagonal matrices and diagonals of a matrix Syntax X = diag(v,k) X = diag(v) v = diag(X,k) v = diag(X) Description X = diag(v,k) when v is a vector of n components, returns a square matrix X of order n+abs(k), with the elements of v on the kth d…
Generalized Low Rank Approximations of Matrices JIEPING YE*jieping@cs.umn.edu Department of Computer Science & Engineering,University of Minnesota-Twin Cities, Minneapolis, MN 55455, USA Published online:12 August 2005 Abstract.The problem of…
CF992E Nastya and King-Shamans 题意翻译 给定一个序列 \(a_i\),记其前缀和序列为 \(s_i\),有 \(q\) 个询问,每次单点修改,询问是否存在一个 \(i\) 满足 \(a_i=s_{i-1}\),有多解输出任意一个,无解输出 \(-1\). 输入输出格式 输入格式: The first line contains two integers \(n\) and \(q\) The second line contains n n integers \(…
时间限制:1 秒 内存限制:32 兆 特殊判题:否 提交:17682 解决:7079 题目描述: This time, you are supposed to find A+B where A and B are two matrices, and then count the number of zero rows and columns. 输入: The input consists of several test cases, each starts with a pair of posi…
思路: 1. 最终答案不超过能与Nastya“直接交换”的人数. 2. 对于排在j前面的i,如果i和i-j之间(包括j)的每个人都能“直接交换”,j才能前进一步. 实现: #include <bits/stdc++.h> using namespace std; ; int a[N], p[N], cnt[N]; vector<int> v[N]; int main() { int n, m; while (cin >> n >> m) { ; i <…
B. Nastya Studies Informatics time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Today on Informatics class Nastya learned about GCD and LCM (see links below). Nastya is very intelligent, so s…
http://mathworld.wolfram.com/CongruentMatrices.html Two square matrices and are called congruent if there exists a nonsingular matrix such that where is the transpose. Congruent Exactly equal in size and shape. Congruent sides or segments have th…
Nastya Studies Informatics time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Today on Informatics class Nastya learned about GCD and LCM (see links below). Nastya is very intelligent,…
