题目链接 随机算法使劲水...srand((unsigned)time(0))比srand(NULL)靠谱很多,可能是更加随机. #include <cstdio> #include <cstdlib> #include <cstring> #include <map> #include <ctime> #include <cmath> using namespace std; #define LL __int64 ][],b[][]…

方法1:暴力法 矩阵乘法+优化可以卡时间过的. 方法2:随机化 随机构造向量x[1..n],则有xAB=xC;这样可以将小运算至O(n^2). 代码如下: #include<iostream> #include<stdio.h> #include<cmath> #include<algorithm> using namespace std; ][],b[][],c[][],n,x[]; bool cal() { int i,j,k; ],an2[]; lon…

Matrix Multiplication Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 17783   Accepted: 3845 Description You are given three n × n matrices A, B and C. Does the equation A × B = C hold true? Input The first line of input contains a posit…

Matrix Multiplication Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 18928   Accepted: 4074 Description You are given three n × n matrices A, B and C. Does the equation A × B = C hold true? Input The first line of input contains a posit…

题目大意:原题链接 给定三个n*n的矩阵A,B,C,验证A*B=C是否成立. 所有解法中因为只测试一组数据,因此没有使用memset清零 Hint中给的傻乎乎的TLE版本: #include<cstdio> #include<cstring> ][]; ][],C[][]; ][]) { ;i<=n;i++){ ;j<=n;j++) scanf("%d",&m[i][j]); } } int main() { scanf("%d&q…

http://poj.org/problem?id=3318 矩阵A*矩阵B是否等于矩阵C #include <cstdio> #include <cstring> #include <time.h> #include <algorithm> #define maxn 1010 using namespace std; int a[maxn][maxn],b[maxn][maxn],c[maxn][maxn],d[maxn]; int n; int b1[m…

Description You are given three n × n matrices A, B and C. Does the equation A × B = C hold true? Input The first line of input contains a positive integer n (n ≤ 500) followed by the the three matrices A, B and C respectively. Each matrix's descript…

题目链接 题意 : 给你三个n维矩阵,让你判断A*B是否等于C. 思路 :优化将二维转化成一维的.随机生成一个一维向量d,使得A*(B*d)=C*d,多次生成多次测试即可使错误概率大大减小. #include <stdio.h> #include <string.h> #include <time.h> #include <stdlib.h> #include <iostream> using namespace std ; ][],b[][],…

随机化还是很厉害的...印象最深的是以前手写快排~~一般加个随机化会使耗时不受输入数据的..时间更加稳定 这个题是人品题了...开始交了好多遍都过不了..多交几次终于过了... Program: #include<iostream> #include<stack> #include<queue> #include<stdio.h> #include<algorithm> #include<string.h> #include<t…

#include<cstdio> using namespace std; ][]; ][],C[][]; int Read() { ; ; while((ch=getchar())==' '||ch=='\n') ; ; '; ') d=d*+ch-'; if(t) return -d; else return d; } int main() { scanf("%d",&n); bool sign=true; ;i<n;i++){ ;j<n;j++)…