https://www.acmicpc.net/problem/2740
<요약>
NxM크기의 행렬 A와 MxK크기의 행렬 B가 주어졌을 때, 두 행렬을 곱하는 프로그램을 작성하시오.
for (int i = 0; i < n; i++) {
for (int j = 0; j < k; j++) {
int result = 0;
for (int s = 0; s < m; s++) {
result += arr[i][s] * brr[s][j];
}
cout << result << ' ';
}
cout << '\n';
}
#include <iostream>
using namespace std;
int main(void) {
ios::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
int n, m, k;
cin >> n >> m;
int arr[101][101] = { 0 }, brr[101][101] = { 0 };
for (int i = 0; i < n; i++) {
for (int j = 0; j < m; j++) {
cin >> arr[i][j];
}
}
cin >> m >> k;
for (int i = 0; i < m; i++) {
for (int j = 0; j < k; j++) {
cin >> brr[i][j];
}
}
for (int i = 0; i < n; i++) {
for (int j = 0; j < k; j++) {
int result = 0;
for (int s = 0; s < m; s++) {
result += arr[i][s] * brr[s][j];
}
cout << result << ' ';
}
cout << '\n';
}
return 0;
}