https://school.programmers.co.kr/learn/courses/30/lessons/12949
๋ด ์ฝ๋
ํ๋ ฌ ์ฐ์ฐ์ ๊ตฌํํ๋ฉด ๋๋ค.
ํ๋ ฌ ์ฐ์ฐ ๋ฐฉ๋ฒ์ ์ฝ๋๋ก ์ฎ๊ธฐ๋ ๊ฒ ์กฐ๊ธ ๋จธ๋ฆฌ ์ํ ๋ค.
#include <string>
#include <vector>
using namespace std;
vector<vector<int>> solution(vector<vector<int>> arr1, vector<vector<int>> arr2) {
    vector<vector<int>> answer(arr1.size(), vector<int>(arr2[0].size(), 0));
             
    for(int m = 0; m < answer.size(); ++m)
        for(int n = 0; n < answer[0].size(); ++n)
            for(int i = 0; i < arr1[0].size(); ++i)
                answer[m][n] += arr1[m][i] * arr2[i][n];
    
    return answer;
}

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