https://adventofcode.com/2020/day/1
You need to find the two entries that sum to 2020 and then multiply those two numbers together.
For example, suppose your expense report contained the following:
1721
979
366
299
675
1456
In this list, the two entries that sum to 2020 are 1721 and 299. Multiplying them together produces
1721 * 299 = 514579, so the correct answer is 514579.
From this path (./advent-code-2020/Day-01-Report-Repair) just:
make run
From this path (./advent-code-2020/Day-01-Report-Repair) just:
make test