题解 | #矩阵乘法#

// HJ69-2 矩阵乘法.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
#include<iostream>
#include<bits/stdc++.h>

using namespace std;

int main()
{
	int x, y, z;
	while (cin >> x >> y >> z)
	{
		vector<vector<int>>v1(x, vector<int>(y));
		vector<vector<int>>v2(y, vector<int>(z));
		vector<vector<int>>res(x, vector<int>(z));
		for (int i = 0; i < x; i++)
		{
			for (int j = 0; j < y; j++)
			{
				cin >> v1[i][j];
			}
		}
		for (int i = 0; i < y; i++)
		{
			for (int j = 0; j < z; j++)
			{
				cin >> v2[i][j];
			}
		}
		for (int i = 0; i < x; i++)
		{
			for (int j = 0; j < z; j++)
			{
				for (int k = 0; k < y; k++)
				{
					res[i][j] += v1[i][k] * v2[k][j];
				}
			}
		}
		for (int i = 0; i < x; i++)
		{
			for (int j = 0; j < z-1; j++)
			{
				cout << res[i][j]<<" ";
			}
			cout << res[i][z - 1] << endl;
		}
	}
	return 0;
}