http://acm.hdu.edu.cn/showproblem.php?pid=1296 随手练习 #include <bits/stdc++.h> using namespace std; #define ll long long int n; ]; ll Solve(string s,int i) { ll num=; ; ; string s1=""; ') { s1+=s[l]; l--; } reverse(s1.begin(),s1.end()); ll a…

We have learned how to obtain the value of a polynomial when we were a middle school student. If f(x) is a polynomial of degree n, we can let If we have x, we can get f(x) easily. But a computer can not understand the expression like above. So we had…

Problem Description We have learned how to obtain the value of a polynomial when we were a middle school student. If f(x) is a polynomial of degree n, we can let.If we have x, we can get f(x) easily. But a computer can not understand the expression l…

Description 题目描述 You are given an polynomial of x consisting of only addition marks, multiplication marks, brackets, single digit numbers, and of course the letter x. For example, a valid polynomial would be: (1+x)*(1+x*x+x+5)+1*x*x. You are required…

比赛时没做出这题太可惜了. 赛后才反应过来这就是个中缀表达式求值,数字栈存的不是数字而是多项式. 而且,中缀表达式求值很水的,几行就可以搞定. #include<cstdio> #include<cstring> #include<algorithm> using namespace std; struct Poly{ ]; Poly operator+(const Poly &p)const{ Poly np={}; ; i<; ++i){ np.a[i…

from:piaocoder Common Tangents(两圆之间的公公切线) 题目链接: http://acm.fzu.edu.cn/problem.php?pid=2213 解题思路: 告诉你两个圆的圆心与半径,要你找出他们的公共切线的个数. 套模板即可. http://blog.csdn.net/piaocoder/article/details/41649089 #include <iostream> #include <cstdio> #include <cma…

NOIp初赛题目整理 这个 blog 用来整理扶苏准备第一轮 csp 时所做的与 csp 没 有 关 系 的历年 noip-J/S 初赛题目,记录了一些我从不知道的细碎知识点,还有一些憨憨题目,不定期更新. 1.(07senior,5) 在C 语言中,表达式 \(23~\mid~2~\land^~5\) 的值是( ) ​ A. \(23\) B.\(1\) C.\(18\) D.\(32\) E.\(24\) Answer:A Solution:这题一看就是要考运算符优先级来着.在 \(C\)…

B. Clique Problem time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output The clique problem is one of the most well-known NP-complete problems. Under some simplification it can be formulated as f…

[codeforces 528]B. Clique Problem 试题描述 The clique problem is one of the most well-known NP-complete problems. Under some simplification it can be formulated as follows. Consider an undirected graph G. It is required to find a subset of vertices C of…

Integration of Polynomial Time Limit: 2000/1000MS (Java/Others) Memory Limit: 128000/64000KB (Java/Others) Submit Statistic Next Problem Problem Description Suppose there are a polynomial which has n nonzero terms, please print the integration polyno…

Problem F: Polynomial Remains Given the polynomial a(x) = an xn + ... + a1 x + a0, compute the remainder r(x) when a(x) is divided by xk+1. The input consists of a number of cases. The first line of each case specifies the two integers n and k (0 ≤ n…

Vasya is studying in the last class of school and soon he will take exams. He decided to study polynomials. Polynomial is a function P(x) = a0 + a1x1 + ... + anxn. Numbers ai are called coefficients of a polynomial, non-negative integer n is called a…

We know that the longest path problem for general case belongs to the NP-hard category, so there is no known polynomial time solution for it. However, for a special case which is directed acyclic graph, we can solve this problem in linear time. First…

一起啃PRML - 1.1 Example: Polynomial Curve Fitting @copyright 转载请注明出处 http://www.cnblogs.com/chxer/ 前言:真是太糟糕了,本地的公式和图片粘上来全都喂汪了... We begin by introducing a simple regression problem, 用一个例子穿起这些零碎的知识点. 回顾最前面的Mathematical Notation: A superscript T denotes…

Description The clique problem is one of the most well-known NP-complete problems. Under some simplification it can be formulated as follows. Consider an undirected graph G. It is required to find a subset of vertices C of the maximum size such that…

离散对数问题,英文是Discrete logarithm Problem,有时候简写为Discrete log,该问题是十几个开放数学问题(Open Problems in Mathematics, [0.a], [0.b])中的一个.为什么要从离散对数问题说起?因为后面的内容中会反复使用到,因此我们希望用独立的一节分析来消除理解上的不确定性. 0x01 背景 对数\(\log_{b}(a)\)是由John Napier发明(1614)的符号([1],[2.a],[2.b]),选择不同的基底,就…

0x01 从判定问题到形式语言 这篇讲知识证明的wiki([1]): https://en.wikipedia.org/wiki/Proof_of_knowledge 里面有一句话: Let x be a language element of language L in NP 这篇讲NPC的文章([2]) http://www.cs.princeton.edu/courses/archive/spr11/cos423/Lectures/NP-completeness.pdf 里面提到Decis…

代码: 子函数ampl_res function [Hr,w,P,L] = ampl_res(h); % % function [Hr,w,P,L] = Ampl_res(h) % Computes Amplitude response Hr(w) and its polynomial P of order L, % given a linear-phase FIR filter impulse response h. % The type of filter is determined aut…

最重要的是找规律. 下面是引用 http://blog.sina.com.cn/s/blog_4dc813b20100snyv.html 的讲解: 做这题时,千万不要被那个图给吓着了,其实这题就是道简单的数学题. 首先看当m或n中有一个为2的情况,显然,只需要算周长就OK了.即(m+n-)*,考虑到至少其中一个为2,所以答案为2 *m或2*n,亦即m*n.注意这里保证了其中一个数位偶数. 当m,n≥3时,考虑至少其中一个为偶数的情况,显然,这种情况很简单,可以得出,结果为m*n,又可以和上面这种…

今天擦完了玻璃,尽管有地方不那么明亮干净,冷风中瑟瑟发抖,年也快临近了. 代码是从网上找的, function [p, np, r, nr] = deconv_m(b, nb, a, na) % Modified deconvolution routine for noncausal sequences % ---------------------------------------------------- % function [p, np, r, nr] = deconv_m(b, nb…

B. Clique Problem time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output The clique problem is one of the most well-known NP-complete problems. Under some simplification it can be formulated as f…

1 Fundamentals A polynomial is either zero, or can be written as the sum of one or more non-zero terms. The number of terms is finite. A term consist of a constant coefficient and a monomial, that is, the product of zero or more variables. Each varia…

题目链接: B. Clique Problem time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output The clique problem is one of the most well-known NP-complete problems. Under some simplification it can be formulate…

To understand the difference between polynomial time and pseudopolynomial time, we need to start off by formalizing what "polynomial time" means. The common intuition for polynomial time is "time O(nk) for some k." For example, selecti…

Vasya is studying in the last class of school and soon he will take exams. He decided to study polynomials. Polynomial is a function P(x) = a0 + a1x1 + ... + anxn. Numbers ai are called coefficients of a polynomial, non-negative integer n is called a…

传送门 D. Clique Problem time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output The clique problem is one of the most well-known NP-complete problems. Under some simplification it can be formulated…

1. Main Point 0x1:行文框架 第二章:我们会分别介绍NNs神经网络和PR多项式回归各自的定义和应用场景. 第三章:讨论NNs和PR在数学公式上的等价性,NNs和PR是两个等价的理论方法,只是用了不同的方法解决了同一个问题,这样我们就形成了一个统一的观察视角,不再将深度神经网络看成是一个独立的算法. 第四章:讨论通用逼近理论,这是为了将视角提高到一个更高的框架体系,通用逼近理论证明了所有的目标函数都可以拟合,换句话说就是,所有的问题都可以通过深度学习解决.但是通用逼近理论并没有告诉…

代码: function [wpLP, wsLP, alpha] = bs2lpfre(wpbs, wsbs) % Band-edge frequency conversion from bandstop to lowpass digital filter % ------------------------------------------------------------------------- % [wpLP, wsLP, alpha] = bs2lpfre(wpbs, wsbs)…

上代码: function [wpLP, wsLP, alpha] = lp2lpfre(wplp, wslp) % Band-edge frequency conversion from lowpass to lowpass digital filter % ------------------------------------------------------------------------- % [wpLP, wsLP, alpha] = lp2lpfre(wplp, wslp)…

今天下了小雨,空气中泛起潮湿的味道,阴冷的感觉袭来,心情受到小小影响. 代码: hp2lpfre子函数 function [wpLP, wsLP, alpha] = hp2lpfre(wphp, wshp) % Band-edge frequency conversion from highpass to lowpass digital filter % -----------------------------------------------------------------------…