[프로그래머스 2] 행렬의 곱셈 (C/C++)

#include <string>
#include <vector>
#include <iostream>
using namespace std;
 
vector<vector<int>> solution(vector<vector<int>> arr1, vector<vector<int>> arr2) 
{
    vector<vector<int>> answer;
    
    for(int i = 0; i < arr1.size(); i++)
    {
        vector<int> temp; 
        
        for(int k = 0; k < arr2[0].size(); k++)
        {
            int sum = 0;   
            
            for(int j = 0; j < arr1[i].size(); j++)
            {     
                sum += arr1[i][j] * arr2[j][k];
            }   
            
            temp.push_back(sum);
        }
        
        answer.push_back(temp);
    }
    
    return answer;
}