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BOJ_2740.java
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/
BOJ_2740.java
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import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
public class Main {
private int[][] matrixMult(int[][] a, int[][] b) {
int r = a.length;
int c = b[0].length;
int[][] arr = new int[r][c];
for (int i = 0; i < r; i++) {
for (int j = 0; j < c; j++) {
for (int k = 0; k < b.length; k++) {
arr[i][j] += a[i][k] * b[k][j];
}
}
}
return arr;
}
private void solution() throws Exception {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
StringTokenizer st = new StringTokenizer(br.readLine());
int n = Integer.parseInt(st.nextToken());
int m = Integer.parseInt(st.nextToken());
int[][] a = new int[n][m];
for (int i = 0; i < n; i++) {
st = new StringTokenizer(br.readLine());
for (int j = 0; j < m; j++) {
a[i][j] = Integer.parseInt(st.nextToken());
}
}
st = new StringTokenizer(br.readLine());
n = Integer.parseInt(st.nextToken());
m = Integer.parseInt(st.nextToken());
int[][] b = new int[n][m];
for (int i = 0; i < n; i++) {
st = new StringTokenizer(br.readLine());
for (int j = 0; j < m; j++) {
b[i][j] = Integer.parseInt(st.nextToken());
}
}
int[][] answer = matrixMult(a, b);
StringBuilder sb = new StringBuilder();
for (int i = 0; i < answer.length; i++) {
for (int j = 0; j < answer[0].length; j++) {
sb.append(answer[i][j]).append(' ');
}
sb.append('\n');
}
System.out.print(sb);
}
public static void main(String[] args) throws Exception {
new Main().solution();
}
}