Doing problems in these orders to help me on my programming interviews.
5.1*,5.7, 5.8 6.1*,6.6*,6.11,6.17 7.1*,7.2,7.4 8.1*,8.2,8.3 9.1*,9.7 10.1*,10.4 11.1*,11.4 12.1*,12.4, 13.2*,13.6,13.3 14.1*,14.2 15.1*,15.2,15.3 16.1*,16.2 17.1*,17.2 18.4*,18.6 19.1*,19.7 20.3*,20.6 21.13*,21.15