|
@ -33,14 +33,43 @@ namespace AdventOfCode { |
|
|
throw new Exception("didn't find an invalid int"); |
|
|
throw new Exception("didn't find an invalid int"); |
|
|
} |
|
|
} |
|
|
|
|
|
|
|
|
|
|
|
static long CalculateWeakness(List<long> longs, int minIndex, int maxIndex) { |
|
|
|
|
|
long largest = 0; |
|
|
|
|
|
long smallest = long.MaxValue; |
|
|
|
|
|
for (int i = minIndex; i <= maxIndex; i++) { |
|
|
|
|
|
if (longs[i] > largest) { |
|
|
|
|
|
largest = longs[i]; |
|
|
|
|
|
} |
|
|
|
|
|
if (longs[i] < smallest) { |
|
|
|
|
|
smallest = longs[i]; |
|
|
|
|
|
} |
|
|
|
|
|
} |
|
|
|
|
|
return smallest + largest; |
|
|
|
|
|
} |
|
|
|
|
|
|
|
|
|
|
|
static long FindWeakness(List<long> longs, long target) { |
|
|
|
|
|
for (int i = 0; i < longs.Count() - 1; i++) { |
|
|
|
|
|
long total = 0; |
|
|
|
|
|
for (int j = i; j < longs.Count() && total < target; j++) { |
|
|
|
|
|
total += longs[j]; |
|
|
|
|
|
if (total == target) { |
|
|
|
|
|
return CalculateWeakness(longs, i, j); |
|
|
|
|
|
} |
|
|
|
|
|
} |
|
|
|
|
|
} |
|
|
|
|
|
throw new Exception("didn't find a weakness"); |
|
|
|
|
|
} |
|
|
|
|
|
|
|
|
static long Part1() { |
|
|
static long Part1() { |
|
|
string[] input = File.ReadAllLines(Util.RootDir + "day09.txt"); |
|
|
string[] input = File.ReadAllLines(Util.RootDir + "day09.txt"); |
|
|
List<long> longs = input.ToList().Select(long.Parse).ToList(); |
|
|
List<long> longs = input.ToList().Select(long.Parse).ToList(); |
|
|
return FindInvalid(longs, 25); |
|
|
return FindInvalid(longs, 25); |
|
|
} |
|
|
} |
|
|
|
|
|
|
|
|
static int Part2() { |
|
|
|
|
|
return -1; |
|
|
|
|
|
|
|
|
static long Part2(long target) { |
|
|
|
|
|
string[] input = File.ReadAllLines(Util.RootDir + "day09.txt"); |
|
|
|
|
|
List<long> longs = input.ToList().Select(long.Parse).ToList(); |
|
|
|
|
|
return FindWeakness(longs, target); |
|
|
} |
|
|
} |
|
|
|
|
|
|
|
|
[Fact] |
|
|
[Fact] |
|
@ -69,8 +98,9 @@ namespace AdventOfCode { |
|
|
List<long> longs = example.ToList().Select(long.Parse).ToList(); |
|
|
List<long> longs = example.ToList().Select(long.Parse).ToList(); |
|
|
Assert.Equal(127, FindInvalid(longs, 5)); |
|
|
Assert.Equal(127, FindInvalid(longs, 5)); |
|
|
|
|
|
|
|
|
Assert.Equal(50047984, Part1()); |
|
|
|
|
|
Assert.Equal(-1, Part2()); |
|
|
|
|
|
|
|
|
long invalidNumber = Part1(); |
|
|
|
|
|
Assert.Equal(50047984, invalidNumber); |
|
|
|
|
|
Assert.Equal(5407707, Part2(invalidNumber)); |
|
|
} |
|
|
} |
|
|
} |
|
|
} |
|
|
} |
|
|
} |