diff options
| -rw-r--r-- | Day4.cs | 33 |
1 files changed, 12 insertions, 21 deletions
diff --git a/Day4.cs b/Day4.cs index 8e57b00..695ccac 100644 --- a/Day4.cs +++ b/Day4.cs @@ -22,42 +22,33 @@ namespace aoc2019 private bool IsValid(int i) { - return Math.Floor(Math.Log10(i) + 1) == 6 - && i >= start - && i <= end - && IsIncreasingDigits(i); - } - - private bool IsIncreasingDigits(int i) - { - int prev = 0; - bool hasDup = false; + int prev = 0; bool hasDup = false; foreach (var c in i.ToString()) { int curr = c - '0'; - if (curr < prev) - return false; - if (curr == prev) - hasDup = true; + if (curr < prev) return false; + if (curr == prev) hasDup = true; prev = curr; } - return hasDup; + + return i >= start && i <= end && hasDup; } - private bool Part2Criterion(int i) + public override void Part1() { - var s = i.ToString(); - return s.Select(c => s.Count(j => j == c)).Any(c => c == 2); + Console.WriteLine(Enumerable.Range(start, end).Count(i => IsValid(i))); } - public override void Part1() + private bool HasOnePair(int i) { - Console.WriteLine(Enumerable.Range(start, end).Count(i => IsValid(i))); + var s = i.ToString(); + return s.Select(c => s.Count(j => j == c)).Any(c => c == 2); } public override void Part2() { - Console.WriteLine(Enumerable.Range(start,end).Count(i => IsValid(i) && Part2Criterion(i))); + Console.WriteLine(Enumerable.Range(start,end).Count(i => IsValid(i) && HasOnePair(i))); } } } + |