[프로그래머스][Level2] 행렬의 곱셈 c++

https://programmers.co.kr/learn/courses/30/lessons/12949 

프로그래머스

 

풀이 과정

3중 for문에 익숙해지면 풀 수 있는 문제이다.

 

#include <string>
#include <vector>

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> v;
        for(int j = 0; j < arr2[0].size(); j++){
            int sum = 0;
            for(int k = 0; k < arr1[0].size(); k++){
                sum += arr1[i][k] * arr2[k][j];
            }
            v.push_back(sum);
        }
        answer.push_back(v);
    }
    return answer;
}