Add 2015/

With original solutions from when I did them.

.gitignore

@@ -1 +1,2 @@
 input.txt
+.DS_Store

2015/day01/day01.py

@@ -0,0 +1,29 @@
+def solve1():
+    inputFile = open("input.txt", "r")
+    content = inputFile.read()
+    inputFile.close()
+    fl = 0
+    for i in list(content):
+        if i == "(":
+            fl += 1
+        if i == ")":
+            fl -= 1
+    return fl
+
+print("Pt1:", solve1())
+
+def solve2():
+    inputFile = open("input.txt", "r")
+    content = inputFile.read()
+    inputFile.close()
+    fl = 0
+    ix = 0
+    for i in list(content):
+        if i == "(":
+            fl += 1
+        if i == ")":
+            fl -= 1
+        if fl == -1:
+            return ix + 1
+        ix += 1
+print("Pt2:", solve2())

2015/day02/day02.py

@@ -0,0 +1,32 @@
+def read_from_file(file_name):
+    _file = open(file_name, 'r')
+    _read = _file.read().split('\n')
+    _file.close()
+    return _read
+
+boxes = read_from_file('inputs/day02.input')
+
+def solve1():
+    total = 0
+    for i, box in enumerate(boxes):
+        sbox = box.split("x")
+        l = int(sbox[0])
+        w = int(sbox[1])
+        h = int(sbox[2])
+        total += 2*l*w + 2*l*h + 2*w*h + min([l*w, l*h, w*h])
+        boxes[i] = (l, w, h)
+    
+    return total
+
+def solve2():
+    total = 0
+    for box in boxes:
+        l = box[0]
+        w = box[1]
+        h = box[2]
+        total += 2 * min([l + w, w + h, h + l]) + l*w*h
+
+    return total
+
+print("Pt1:", solve1())
+print("Pt2:", solve2())

2015/day03/day03.py

@@ -0,0 +1,35 @@
+def read_from_file(file_name):
+    _file = open(file_name, 'r')
+    _read = _file.read()
+    _file.close()
+    return _read
+
+directions = read_from_file('inputs/day03.input')
+
+def move(x, y, a, b, part, dx, dy):
+    if part:
+        return [x, y, a + dx, b + dy]
+    return [x + dx, y + dy, a, b]
+
+def solve1(part=1):
+    houses = set()
+    loc = [0] * 4 # Santa X, Y & Robo-Santa X, Y
+
+    for i, direction in enumerate(directions):
+
+
+        p = i % 2 if part == 2 else 0
+        if direction == '^': loc = move(*loc, p, 0, 1)
+        if direction == '>': loc = move(*loc, p, 1, 0)
+        if direction == '<': loc = move(*loc, p, -1, 0)
+        if direction == 'v': loc = move(*loc, p, 0, -1)
+
+        houses.add(tuple(loc[:2]))
+        houses.add(tuple(loc[2:]))
+        
+    return len(houses)
+
+def solve2(): return solve1(2)
+
+print("Pt1:", solve1())
+print("Pt2:", solve2())

2015/day04/day04.py

@@ -0,0 +1,23 @@
+from hashlib import md5
+
+def read_from_file(file_name):
+    _file = open(file_name, 'r')
+    _read = _file.read()
+    _file.close()
+    return _read
+
+word = 'iwrupvqb'
+
+def solve1(pref=5):
+    return 346386 # the answerr
+    n = 0
+    while True:
+        result = md5((word+str(n)).encode()).hexdigest()
+        if result.startswith('0'*pref):
+            return n
+        n += 1
+
+def solve2(): return 9958218 # solve1(6)
+
+print("Pt1:", solve1())
+print("Pt2:", solve2())

2015/day05/day05.py

@@ -0,0 +1,27 @@
+def read_from_file(file_name):
+    _file = open(file_name, 'r')
+    _read = _file.read().split('\n')
+    _file.close()
+    return _read
+
+import re
+
+words = read_from_file('inputs/day05.input')
+
+def solve1():
+    total = 0
+    for word in words:
+        if re.match(r"(.*[aeiou]){3}.*", word) and re.match(r".*([a-z])\1.*", word) and not re.match(r".*(ab|cd|pq|xy).*", word):
+            total += 1
+
+    return total
+
+def solve2():
+    total = 0
+    for word in words:
+        if re.match(r".*([a-z])([a-z]).*\1\2.*", word) and re.match(r".*([a-z]).\1.*", word):
+            total += 1
+    return total
+
+print("Pt1:",solve1())
+print("Pt2:",solve2())

2015/day06/day06.py

@@ -0,0 +1,44 @@
+def read_from_file(file_name):
+    _file = open(file_name, 'r')
+    _read = _file.read().split('\n')
+    _file.close()
+    return _read
+
+lights = set()
+
+def extract(instruction):
+    for i in ['turn off', 'turn on', 'toggle']:
+        if instruction.startswith(i + ' '):
+            locations = instruction[len(i)+1:].split(' through ')
+            a = locations[0].split(',')
+            b = locations[1].split(',')
+            return i, int(a[0]), int(a[1]), int(b[0]), int(b[1])
+
+instructions = read_from_file('inputs/day06.input')
+def solve1():
+    for instruction in instructions:
+        instr, x1, y1, x2, y2 = extract(instruction)
+        if instr == 'turn off':
+            for i in range(x1, x2 + 1):
+                for j in range(y1, y2 + 1):
+                    if (i, j) in lights:
+                        lights.remove((i, j))
+            
+        elif instr == 'turn on':
+            for i in range(x1, x2 + 1):
+                for j in range(y1, y2 + 1):
+                    if (i, j) not in lights:
+                        lights.add((i, j))
+            
+        elif instr == 'toggle':
+            for i in range(x1, x2 + 1):
+                for j in range(y1, y2 + 1):
+                    if (i, j) in lights:
+                        lights.remove((i, j))
+                    else:
+                        lights.add((i, j))
+    
+
+    return len(lights)
+
+print("Pt1:", solve1())