91 lines
2.3 KiB
Markdown
91 lines
2.3 KiB
Markdown
|
# Notes
|
||
|
|
|
||
|
|
## Contraints
|
||
|
|
|
||
|
|
- Periods don't count as special characters
|
||
|
|
- All lines have same length
|
||
|
|
- If not a number or period then it is a special character
|
||
|
|
|
||
|
|
Each line parsed need to collect all numbers.
|
||
|
|
|
||
|
|
Can't know whether a collected number is a part number until we
|
||
|
|
have also parsed the proceeding or following line.
|
||
|
|
|
||
|
|
```text
|
||
|
|
467..114..
|
||
|
|
...*......
|
||
|
|
..35..633.
|
||
|
|
......#...
|
||
|
|
617*......
|
||
|
|
```
|
||
|
|
|
||
|
|
After parsing first line we would have `467` with start index 0 and end index 2 and `114` with start index 5 and end index 7.
|
||
|
|
|
||
|
|
For 467 to be a part number it needs to have a special character at index 3 or it needs to have a special character at index 1, 2, 3, 4 on the next line.
|
||
|
|
|
||
|
|
For 114 to be a part number it needs to have a special character at index 4 or index 8 or it needs to have a special character at index 4, 5, 6, 7 on the next line.
|
||
|
|
|
||
|
|
Need to keep track of:
|
||
|
|
|
||
|
|
- Previous line - will start as empty
|
||
|
|
- Current line
|
||
|
|
- Next line
|
||
|
|
|
||
|
|
So you look at the current line and you parse all the numbers with their start and end index. You also parse all special characters with their index.
|
||
|
|
|
||
|
|
Then you end up with something like this: currentLine
|
||
|
|
|
||
|
|
```json
|
||
|
|
{
|
||
|
|
"numbers": [
|
||
|
|
"467": {
|
||
|
|
"start": 0,
|
||
|
|
"end": 2
|
||
|
|
},
|
||
|
|
"114": {
|
||
|
|
"start": 5,
|
||
|
|
"end": 7
|
||
|
|
}
|
||
|
|
],
|
||
|
|
"specialCharacters": []
|
||
|
|
}
|
||
|
|
```
|
||
|
|
|
||
|
|
```csharp
|
||
|
|
var currentLineString = "467..114..";
|
||
|
|
var currentLine = new Line(currentLineString);
|
||
|
|
|
||
|
|
class Line
|
||
|
|
{
|
||
|
|
public List<Dictionary<int, Indexes>> Numbers { get; set; }
|
||
|
|
public List<Dictionary<int, Indexes>> SpecialCharacters { get; set; }
|
||
|
|
|
||
|
|
public Line(string line)
|
||
|
|
{
|
||
|
|
// parse line
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
public class Indexes
|
||
|
|
{
|
||
|
|
public int Start { get; set; }
|
||
|
|
public int End { get; set; }
|
||
|
|
|
||
|
|
public Indexes(int start, int length)
|
||
|
|
{
|
||
|
|
Start = start;
|
||
|
|
End = start + length;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
```
|
||
|
|
|
||
|
|
Then you see if those numbers are part numbers just by checking if a special character proceeds or follows their start and end indexes.
|
||
|
|
|
||
|
|
```csharp
|
||
|
|
```
|
||
|
|
|
||
|
|
If not then you need to see if there is a previous line and whether there is a special character at on the previous line that has an index that is between 1 less than the start index and 1 more than the end index.
|
||
|
|
|
||
|
|
If not then you need to see if there is a next line and whether there is a special character at on the next line that has an index that is between 1 less than the start index and 1 more than the end index.
|
||
|
|
```
|