题目链接:https://www.luogu.org/problem/P4783 题意:求矩阵的逆. 思路:高斯消元法求矩阵的逆,n为400,卡常,我是开了O2优化才AC的.. AC代码: #include<cstdio> #include<cctype> #include<algorithm> #define R register int using namespace std; ; ; int n; struct Matrix{ int m[maxn][maxn];…
function qiuni =INV_GET(a)N=length(a);M=eye(N);%得到上三角矩?for i=1:N max=a(i,i); A=i; for j=i+1:N if(abs(a(j,i))>abs(max))%找最大值 max=a(j,i); A=j; end end for m=1:N temp1=a(i,m);%交换最大值值所在的行和当前行 a(i,m)=a(A,m); a(A,m)=temp1; temp2=M(i,m); M(i,m)=M(A,m); M(A,…
工作中需要用到cvxopt,cvxopt安装有坑,大家注意下.1.首先一定要卸载numpy,无论是直接安装的,还是anaconda安装的,主要是必须用whl安装numpy才不会有包的冲突2.二次规划包的使用二次规划的标准形式如下 Python 代码如下 from cvxopt import matrix import cvxopt.solvers as sol result = sol.qp(P, Q, G, h, A, b) 问题描述: 在实际生活中,我们经常会遇到一些优化问题,简单的线…
python利用kruskal算法求解最短路径的问题,修改参数后可以直接使用 def kruskal(): """ kruskal 算法 """ dimensional = get_array(9999) # 获取数组 node_num = len(dimensional) res = [] count = 0 # 获取节点值 for i in range(node_num): for j in range(i): if 0 < dimen…
D - Disjoint Set of Common Divisors Problem Statement Given are positive integers AA and BB. Let us choose some number of positive common divisors of AA and BB. Here, any two of the chosen divisors must be coprime. At most, how many divisors can we c…