K. 519

#include <iostream>

using namespace std;

int main()
{
    int n; cout<<"Target? "; cin>>n;

    for (short i9=0; i9<10; i9++)
    for (short i8=0; i8<10; i8++)
    for (short i7=0; i7<10; i7++)
    for (short i6=0; i6<10; i6++)
    for (short i5=0; i5<10; i5++)
    for (short i4=0; i4<10; i4++)
    for (short i3=0; i3<10; i3++)
    for (short i2=0; i2<10; i2++)
    for (short i1=0; i1<10; i1++)
    for (short i0=0; i0<10; i0++)
    {
        cout<<i9<<i8<<i7<<i6<<i5<<i4<<i3<<i2<<i1<<i0<<"\r";
        if ( n==-i9*1000000000
                +i8*100000000
                -i7*10000000
                +i6*1000000
                -i5*100000
                +i4*10000
                -i3*1000
                +i2*100
                -i1*10
                +i0*1
        )
            cout<<i9<<i8<<i7<<i6<<i5<<i4<<i3<<i2<<i1<<i0<<"_{-10} = "<<n<<endl;
    }

    return 0;
}