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AdventOfCode2023
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Updated the solution for day 1, part 1 to facilitate part 2

This commit is contained in:
Stefan Müller 2023-12-02 17:50:06 +01:00 committed by Stefan Müller
parent b4352e8b87
commit 3b7bfa3103
1 changed files with 49 additions and 20 deletions
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69
puzzles/utrebuchet.pas
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@ -33,9 +33,12 @@ type
FValue: Integer;
procedure RunSolution;
procedure ProcessDataLine(const ALine: string);
function FindFirstDigit(const ALine: string; out OEndIndex: Integer): Integer;
function FindLastDigit(const ALine: string; const AFirstDigit, AFirstDigitEndIndex: Integer): Integer;
function CheckDigit(const ALine: string; const AIndex: Integer; out ODigit, OEndIndex: Integer): Boolean;
public
class procedure Solve; static;
constructor Create;
class procedure Solve; static;
end;
implementation
@ -58,28 +61,59 @@ begin
finally
CloseFile(data)
end;
WriteLn(FValue);
WriteLn('Part 1: ', FValue);
end;
procedure TTrebuchet.ProcessDataLine(const ALine: string);
var
c: Char;
first, last: Integer;
first, endIndex, last: Integer;
begin
first := -1;
last := -1;
for c in ALine do
begin
if c in ['0'..'9'] then
begin
last := StrToInt(c);
if first < 0 then
first := last;
end;
end;
first := FindFirstDigit(ALine, endIndex);
last := FindLastDigit(ALine, first, endIndex);
Inc(FValue, first * 10 + last);
end;
function TTrebuchet.FindFirstDigit(const ALine: string; out OEndIndex: Integer): Integer;
var
i: Integer;
begin
for i := 1 to ALine.Length do
if CheckDigit(ALine, i, Result, OEndIndex) then
Exit;
end;
function TTrebuchet.FindLastDigit(const ALine: string; const AFirstDigit, AFirstDigitEndIndex: Integer): Integer;
var
i, endIndex: Integer;
begin
for i := ALine.Length downto AFirstDigitEndIndex + 1 do
if CheckDigit(ALine, i, Result, endIndex) then
Exit;
// Returns the first digit if no digit was found after the end index of the first digit.
Result := AFirstDigit;
end;
function TTrebuchet.CheckDigit(const ALine: string; const AIndex: Integer; out ODigit, OEndIndex: Integer): Boolean;
begin
if ALine[AIndex] in ['0'..'9'] then
begin
ODigit := StrToInt(ALine[AIndex]);
OEndIndex := AIndex;
Result := true;
end
else begin
ODigit := -1;
OEndIndex := -1;
Result := false;
end;
end;
constructor TTrebuchet.Create;
begin
FValue := 0;
end;
class procedure TTrebuchet.Solve;
var
trebuchet: TTrebuchet;
@ -90,10 +124,5 @@ begin
trebuchet.Free;
end;
constructor TTrebuchet.Create;
begin
FValue := 0;
end;
end.