算法训练 关联矩阵

 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             Scanner input = new Scanner(System.in);
13             int n = input.nextInt();
14             int m = input.nextInt();
15             int[][] a = new int[n][m];
16             for(int i=0;i<m;i++){
17                 int b = input.nextInt();
18                 int c = input.nextInt();
19                 a[b-1][i] = 1;
20                 a[c-1][i] =  -1;
21             }
22             for(int i=0;i<n;i++){
23                 for(int j=0;j<m;j++){
24                     System.out.print(a[i][j]+" ");
25                 }
26                 System.out.println();
27             }
28             
29         }
30  }