🎄 2019 Day 1 Complete! :D 🎄

2019/day01/problem

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+Advent of Code
+
+--- Day 1: The Tyranny of the Rocket Equation ---
+
+   Santa has become stranded at the edge of the Solar System while delivering presents
+   to other planets! To accurately calculate his position in space, safely align his
+   warp drive, and return to Earth in time to save Christmas, he needs you to bring
+   him measurements from fifty stars.
+
+   Collect stars by solving puzzles. Two puzzles will be made available on each day in
+   the Advent calendar; the second puzzle is unlocked when you complete the first.
+   Each puzzle grants one star. Good luck!
+
+   The Elves quickly load you into a spacecraft and prepare to launch.
+
+   At the first Go / No Go poll, every Elf is Go until the Fuel Counter-Upper. They
+   haven't determined the amount of fuel required yet.
+
+   Fuel required to launch a given module is based on its mass. Specifically, to find
+   the fuel required for a module, take its mass, divide by three, round down, and
+   subtract 2.
+
+   For example:
+
+     * For a mass of 12, divide by 3 and round down to get 4, then subtract 2 to get
+       2.
+     * For a mass of 14, dividing by 3 and rounding down still yields 4, so the fuel
+       required is also 2.
+     * For a mass of 1969, the fuel required is 654.
+     * For a mass of 100756, the fuel required is 33583.
+
+   The Fuel Counter-Upper needs to know the total fuel requirement. To find it,
+   individually calculate the fuel needed for the mass of each module (your puzzle
+   input), then add together all the fuel values.
+
+   What is the sum of the fuel requirements for all of the modules on your spacecraft?
+
+   The first half of this puzzle is complete! It provides one gold star: *
+
+--- Part Two ---
+
+   During the second Go / No Go poll, the Elf in charge of the Rocket Equation
+   Double-Checker stops the launch sequence. Apparently, you forgot to include
+   additional fuel for the fuel you just added.
+
+   Fuel itself requires fuel just like a module - take its mass, divide by three,
+   round down, and subtract 2. However, that fuel also requires fuel, and that fuel
+   requires fuel, and so on. Any mass that would require negative fuel should instead
+   be treated as if it requires zero fuel; the remaining mass, if any, is instead
+   handled by wishing really hard, which has no mass and is outside the scope of this
+   calculation.
+
+   So, for each module mass, calculate its fuel and add it to the total. Then, treat
+   the fuel amount you just calculated as the input mass and repeat the process,
+   continuing until a fuel requirement is zero or negative. For example:
+
+     * A module of mass 14 requires 2 fuel. This fuel requires no further fuel (2
+       divided by 3 and rounded down is 0, which would call for a negative fuel), so
+       the total fuel required is still just 2.
+     * At first, a module of mass 1969 requires 654 fuel. Then, this fuel requires 216
+       more fuel (654 / 3 - 2). 216 then requires 70 more fuel, which requires 21
+       fuel, which requires 5 fuel, which requires no further fuel. So, the total fuel
+       required for a module of mass 1969 is 654 + 216 + 70 + 21 + 5 = 966.
+     * The fuel required by a module of mass 100756 and its fuel is: 33583 + 11192 +
+       3728 + 1240 + 411 + 135 + 43 + 12 + 2 = 50346.
+
+   What is the sum of the fuel requirements for all of the modules on your spacecraft
+   when also taking into account the mass of the added fuel? (Calculate the fuel
+   requirements for each module separately, then add them all up at the end.)
+
+References
+
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