From project euler :

```
By starting at the top of the triangle below and moving to adjacent numbers
on the row below, the maximum total from top to bottom is 23.
3
7 4
2 4 6
8 5 9 3
That is, 3 + 7 + 4 + 9 = 23.
```

Find the maximum total from top to bottom in triangle.txt, a 15K text file containing a triangle with one-hundred rows