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tidy day 4

This commit is contained in:
Ben Harris 2019-12-04 13:42:35 -05:00
parent 184c3ede8b
commit b0c565618b
1 changed files with 13 additions and 22 deletions
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35
Day4.cs
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@ -22,32 +22,16 @@ namespace aoc2019
private bool IsValid(int i) private bool IsValid(int i)
{ {
return Math.Floor(Math.Log10(i) + 1) == 6 int prev = 0; bool hasDup = false;
&& i >= start
&& i <= end
&& IsIncreasingDigits(i);
}
private bool IsIncreasingDigits(int i)
{
int prev = 0;
bool hasDup = false;
foreach (var c in i.ToString()) foreach (var c in i.ToString())
{ {
int curr = c - '0'; int curr = c - '0';
if (curr < prev) if (curr < prev) return false;
return false; if (curr == prev) hasDup = true;
if (curr == prev)
hasDup = true;
prev = curr; prev = curr;
} }
return hasDup;
} return i >= start && i <= end && hasDup;
private bool Part2Criterion(int i)
{
var s = i.ToString();
return s.Select(c => s.Count(j => j == c)).Any(c => c == 2);
} }
public override void Part1() public override void Part1()
@ -55,9 +39,16 @@ namespace aoc2019
Console.WriteLine(Enumerable.Range(start, end).Count(i => IsValid(i))); Console.WriteLine(Enumerable.Range(start, end).Count(i => IsValid(i)));
} }
private bool HasOnePair(int i)
{
var s = i.ToString();
return s.Select(c => s.Count(j => j == c)).Any(c => c == 2);
}
public override void Part2() 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)));
} }
} }
} }