最小和次小值，最大和次大值

    int a[10]={0,1,6,9,67,45,62,23,7,10};
    int j1=0,j2=1;
    if(a[j1]>a[j2])
    {
        int temp=j1;
        j1=j2;
        j2=temp;
    }
    for(int i=2;i<10;i++)
    {
        if(a[j1]>a[i])
        {
            j2=j1;
            j1=i;
        }else if(a[j2]>a[i])
        {
            j2=i;
        }
    }
    cout<<a[j1]<<"	"<<a[j2];