private static IEnumerable <string> ProcessCases(IEnumerable <List <string> > cases)
{
var currentCaseNumber = 0;
foreach (var caseLines in cases)
{
currentCaseNumber++; //1-indexed.
var parsedCase = new CaseInput(caseLines);
var solver = new CaseSolver(parsedCase);
var result = solver.Solve();
var resultText = result.ToString();
yield return($"Case #{currentCaseNumber}: {resultText}");
}
}