new structure for 2018, added license information

2018/01/README.md

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+# 2018 Day 1: Chronal Calibration
+Copyright (c) Eric Wastl 
+#### [Direct Link](https://adventofcode.com/2018/day/1)
+
+## Part 1
+
+After feeling like you've been falling for a few minutes, you look at the device's tiny screen. "Error: Device must be calibrated before first use. Frequency drift detected. Cannot maintain destination lock." Below the message, the device shows a sequence of changes in frequency (your puzzle input). A value like `+6` means the current frequency increases by `6`; a value like `-3` means the current frequency decreases by `3`.
+
+For example, if the device displays frequency changes of `+1, -2, +3, +1`, then starting from a frequency of zero, the following changes would occur:
+
+- Current frequency ` 0`, change of `+1`; resulting frequency ` 1`.
+- Current frequency ` 1`, change of `-2`; resulting frequency `-1`.
+- Current frequency `-1`, change of `+3`; resulting frequency ` 2`.
+- Current frequency ` 2`, change of `+1`; resulting frequency ` 3`.
+
+In this example, the resulting frequency is `3`.
+
+Here are other example situations:
+
+- `+1, +1, +1` results in ` 3`
+- `+1, +1, -2` results in ` 0`
+- `-1, -2, -3` results in `-6`
+
+Starting with a frequency of zero, **what is the resulting frequency** after all of the changes in frequency have been applied?
+
+## Part 2
+
+You notice that the device repeats the same frequency change list over and over. To calibrate the device, you need to find the first frequency it reaches **twice**.
+
+For example, using the same list of changes above, the device would loop as follows:
+
+- Current frequency ` 0`, change of `+1`; resulting frequency ` 1`.
+- Current frequency ` 1`, change of `-2`; resulting frequency `-1`.
+- Current frequency `-1`, change of `+3`; resulting frequency ` 2`.
+- Current frequency ` 2`, change of `+1`; resulting frequency ` 3`.
+- (At this point, the device continues from the start of the list.)
+- Current frequency ` 3`, change of `+1`; resulting frequency ` 4`.
+- Current frequency ` 4`, change of `-2`; resulting frequency ` 2`, which has already been seen.
+
+In this example, the first frequency reached twice is `2`. Note that your device might need to repeat its list of frequency changes many times before a duplicate frequency is found, and that duplicates might be found while in the middle of processing the list.
+
+Here are other examples:
+
+- `+1, -1` first reaches `0` twice.
+- `+3, +3, +4, -2, -4` first reaches `10` twice.
+- `-6, +3, +8, +5, -6` first reaches `5` twice.
+- `+7, +7, -2, -7, -4` first reaches `14` twice.
+
+**What is the first frequency your device reaches twice?**

2018/01/code.py

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+""" https://adventofcode.com/2018/day/1 """
+
+def readFile():
+    l = []
+    with open(f"{__file__.rstrip('code.py')}input.txt", "r") as f:
+        line = f.readline()
+        while line:
+            l.append(int(line))
+            line = f.readline()
+    return l
+
+def part1(vals : list):
+    sum = 0
+    for val in vals:
+        sum += val
+    return sum
+
+def part2(vals : list):
+    sum = 0
+    s = {sum}
+    while True:
+        for val in vals:
+            sum += val
+            if sum in s:
+                return sum
+            s.add(sum)
+    return sum
+
+if __name__ == "__main__":
+    vals = readFile()
+    print(f"Part 1: {part1(vals)}")
+    print(f"Part 2: {part2(vals)}")

2018/01/input.txt

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2018/01/solution.txt

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+Part 1: 433
+Part 2: 256