算法训练 关联矩阵

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <cstdlib>
#define for(i,x,n) for(int i=x;i<n;i++)
#define ll long long int

using namespace std;

int a[105][1005]={0};

int main()
{
    int m,n;
    int x,y;
    scanf("%d %d",&n,&m);
    for(i,0,m){
        scanf("%d %d",&x,&y);
        a[x][i]=1;
        a[y][i]=-1;
    }
    for(i,1,n+1){
        for(j,0,m){
            printf("%d ",a[i][j]);
        }
        printf("\n");
    }
    return 0;
}