floyd输出路径,不知道哪里有问题。 （样例过来,wa65分）

#include<iostream>
#include<cstring>
#include<climits>
using namespace std;
long long lj[1005][1005];
int path[1005][1005];
int n,m,q;
void print(int x,int y)
{
    if(path[x][y]==-1)
        return;
    print(x,path[x][y]);
    cout<<path[x][y]<<" ";
    print(path[x][y],y);
}
int main()
{
    cin>>n>>m>>q;
    memset(path,-1,sizeof(path));
    for(int i=1;i<=n;++i)
    {
        for(int j=1;j<=n;++j)
        {
            lj[i][j]=0x3f3f3f3f3f3f3f3f;
        }
    }
    for(int i=1;i<=m;++i)
    {
        int l,r;
        long long w;
        cin>>l>>r>>w;
        lj[r][l]=lj[l][r]=min(lj[l][r],min(lj[r][l],w));
    }
    for(int k=1;k<=n;++k)
    {
        for(int i=1;i<=n;++i)
        {
            if(i==k)
                continue;
            for(int j=1;j<=n;++j)
            {
                if(j!=k&&i!=j)
                {
                    if(lj[i][k]+lj[k][j]<lj[i][j])
                    {
                        lj[i][j]=lj[i][k]+lj[k][j];
                        path[i][j]=k;
                    }
                    else if(lj[i][k]+lj[k][j]==lj[i][j])
                    {
                        if(k<path[i][j]||path[i][j]==-1)
                            path[i][j]=k;
                    }
                }
            }
        }
    }
    for(int i=1;i<=q;++i)
    {
        int x,y;
        cin>>x>>y;
        if(x==y)
        {
            cout<<0<<endl;
            cout<<x<<endl;
            continue;
        }
        else if(lj[x][y]==0x3f3f3f3f3f3f3f3f)
        {
            cout<<-1<<endl;
            continue;
        }
        cout<<lj[x][y]<<endl;
        cout<<x<<" ";
        print(x,y);
        cout<<y<<" ";
        cout<<endl;
    }
}