算法训练 矩阵乘法

 1 import java.text.DecimalFormat;
 2 import java.text.NumberFormat;
 3 import java.util.ArrayList;
 4 import java.util.Arrays;
 5 import java.util.Collection;
 6 import java.util.Collections;
 7 import java.util.List;
 8 import java.util.Scanner;
 9 import java.util.Stack;  
10     public class Main{   
11         public static void main(String[] args){ 
12             int m,s,n;
13             Scanner input = new Scanner(System.in);
14             m = input.nextInt();
15             s = input.nextInt();
16             n = input.nextInt();
17             int[][] a = new int[m][s];
18             int[][] b = new int[s][n];
19             int[][] c = new int[m][n];
20             for(int i=0;i<m;i++){
21                 for(int j=0;j<s;j++){
22                     a[i][j] = input.nextInt();
23                 }
24             }
25             for(int i=0;i<s;i++){
26                 for(int j=0;j<n;j++){
27                     b[i][j] = input.nextInt();
28                 }
29             }
30             for(int i=0;i<m;i++){
31                 for(int j=0;j<n;j++){
32                     int sum = 0;
33                     for(int k=0;k<s;k++){
34                         sum = sum+a[i][k]*b[k][j];
35                     }
36                     c[i][j] = sum;
37                 }
38             }
39             for(int i=0;i<m;i++){
40                 for(int j=0;j<n;j++){
41                     System.out.print(c[i][j]+" ");
42                 }
43                 System.out.println();
44             }
45             
46         }
47  }