Upstairs/Downstairs solutions

Upstairs/Downstairs was solved using C++ by 18 contestants.

1. download meret (S, L)
2. download neal.wu (S, L)
3. download misof (S, L)
4. download vepifanov (S, L)
6. download bmerry (S, L)
7. download watashi (S, L)
8. download SnapDragon (S)
9. download dzhulgakov (S, L)
11. download g201513 (S, L)
12. download Farmer.John (S, L)
13. download Ahyangyi (S, L)
14. download exod40 (S, L)
16. download Burunduk1 (S)
18. download sdya (S)
19. download rng..58 (S, L)
21. download Dlougach (S)
22. download paladin8 (S, L)
24. download Vasyl (S, L)