Day 666

day06/data/input100.txt

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+Time:      7  15   30
+Distance:  9  40  200

day06/data/input101.txt

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+Time:        59     70     78     78
+Distance:   430   1218   1213   1276

day06/task1.py

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+from math import sqrt, floor, ceil
+
+
+def do_task(input):
+    lines = input.split("\n")
+
+    times = [int(t) for t in lines[0].split()[1:]]
+    distances = [int(d) for d in lines[1].split()[1:]]
+
+    prod = 1
+
+    for i in range(len(times)):
+        a = -1
+        b = 1 + times[i] - 1
+        c = -distances[i]
+
+        max_h = (-b - sqrt(b**2 - 4 * a * c)) / (2 * a)
+        min_h = (-b + sqrt(b**2 - 4 * a * c)) / (2 * a) + 1
+
+        prod *= ceil(max_h) - floor(min_h)
+
+    return prod
+
+# This actually works
+def do_task_the_dumb_way(input):
+    lines = input.split("\n")
+
+    times = [int(t) for t in lines[0].split()[1:]]
+    distances = [int(d) for d in lines[1].split()[1:]]
+
+    prod = 1
+
+    for i in range(len(times)):
+        ways = 0
+        for h in range(times[i]):
+            d = 0
+            for t in range(times[i] - h):
+                d += h
+            if d > distances[i]:
+                ways += 1
+        prod *= ways
+
+    return prod
+
+
+with open("day06/data/input100.txt") as infile:
+    result = do_task(infile.read())
+    print(result)
+    print(result == 288)
+
+with open("day06/data/input101.txt") as infile:
+    result = do_task(infile.read())
+    print(result)
+    print(result == 227850)

day06/task2.py

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+from math import sqrt, floor, ceil
+
+
+def do_task(input):
+    lines = input.split("\n")
+
+    time = int("".join(lines[0].split()[1:]))
+    distance = int("".join(lines[1].split()[1:]))
+
+    a = -1
+    b = 1 + time - 1
+    c = -distance
+
+    max_h = (-b - sqrt(b**2 - 4 * a * c)) / (2 * a)
+    min_h = (-b + sqrt(b**2 - 4 * a * c)) / (2 * a) + 1
+
+    return ceil(max_h) - floor(min_h)
+
+# Kind of slow, but workable
+def do_task_the_dumb_way(input):
+    lines = input.split("\n")
+
+    time = int("".join(lines[0].split()[1:]))
+    distance = int("".join(lines[1].split()[1:]))
+
+    ways = 0
+    for h in range(time):
+        d = (time - h) * h
+
+        # This is how dumb you have to make it to make it run slow
+        # for t in range(time - h):
+        #     d+=h
+        if d > distance:
+            ways += 1
+
+    return ways
+
+
+with open("day06/data/input100.txt") as infile:
+    result = do_task(infile.read())
+    print(result)
+    print(result == 71503)
+
+with open("day06/data/input101.txt") as infile:
+    result = do_task(infile.read())
+    print(result)
+    print(result == 42948149)