add solution 2 in C++, tweak docs #181
| Job | Run time |
|---|---|
| 13m 7s | |
| 11m 20s | |
| 13m 52s | |
| 11m 50s | |
| 11m 50s | |
| 11m 15s | |
| 13m 39s | |
| 11m 16s | |
| 10m 45s | |
| 8m 32s | |
| 10m 55s | |
| 24m 56s | |
| 10m 51s | |
| 11m 46s | |
| 5m 40s | |
| 6m 52s | |
| 17m 49s | |
| 12m 5s | |
| 13m 21s | |
| 15m 17s | |
| 17m 26s | |
| 17m 18s | |
| 16m 10s | |
| 13m 20s | |
| 12m 20s | |
| 5h 23m 32s |