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day_01_solver.dart
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day_01_solver.dart
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import 'package:h3x_devtools/solvers/solver.dart';
class Day01Solver extends Solver<String, String> {
@override
String get problemUrl => 'https://adventofcode.com/2021/day/1';
@override
String get solverCodeFilename => 'day_01_solver.dart';
@override
String getSolution(String input) {
List<int> measurements = input
.split('\n')
.where((rawMeasurement) => rawMeasurement.isNotEmpty)
.map((rawMeasurement) => int.parse(rawMeasurement))
.toList();
// part 1
int nLargerThanPrevious = 0;
int? previousValue;
for (int measurement in measurements) {
if (previousValue != null && measurement > previousValue) {
nLargerThanPrevious++;
}
previousValue = measurement;
}
// part 2
int nThreeMeasurementSlidingWindowLargerThanPrevious = 0;
int? previousThreeMeasurementSlidingWindowValue;
for (int i = 0; i < measurements.length - 2; i += 1) {
int total = measurements[i] + measurements[i + 1] + measurements[i + 2];
if (previousThreeMeasurementSlidingWindowValue != null && total > previousThreeMeasurementSlidingWindowValue) {
nThreeMeasurementSlidingWindowLargerThanPrevious++;
}
previousThreeMeasurementSlidingWindowValue = total;
}
return 'Measurements larger than the previous: $nLargerThanPrevious\nThree-measurement sliding window sums larger than the previous: $nThreeMeasurementSlidingWindowLargerThanPrevious';
}
}