public static Output TraverseMatrixFromBack(Helfer.Matrix <int> mat)
{
for (int index = mat.Length - 2; index >= 0; index--)
{
int botEl = mat.GetRow(index) == mat.RowNum - 1 ? int.MaxValue : mat.GetElement(mat.GetRow(index) + 1, mat.GetCol(index)); // If LAST ROW: int.Max ELSE: take bottom element
int rightEl = mat.GetCol(index) == mat.ColNum - 1 ? int.MaxValue : mat.GetElement(mat.GetRow(index), mat.GetCol(index) + 1); // If LAST COL: int.Max ELSE: take right element
mat.SetElementAtIndex(index, mat.GetElementAtIndex(index) + Math.Min(botEl, rightEl)); // Add smaller accumulated element to current
// This means it goes along the path with the smaller sum
// The smaller sum accumulates along the path
}
Helfer.Point[] trace = new Helfer.Point[mat.RowNum + mat.ColNum - 1];
for (int ind = 0, ptTrace = 0; ptTrace < trace.Length;)
{
trace[ptTrace++] = new Helfer.Point(mat.GetRow(ind), mat.GetCol(ind));
int botEl = mat.GetRow(ind) == mat.RowNum - 1 ? int.MaxValue : mat.GetElement(mat.GetRow(ind) + 1, mat.GetCol(ind));
int rightEl = mat.GetCol(ind) == mat.ColNum - 1 ? int.MaxValue : mat.GetElement(mat.GetRow(ind), mat.GetCol(ind) + 1);
if (botEl < rightEl)
{
ind = mat.EncodePos(mat.GetRow(ind) + 1, mat.GetCol(ind));
}
else
{
ind = mat.EncodePos(mat.GetRow(ind), mat.GetCol(ind) + 1);
}
}
return(new Output(mat.GetElementAtIndex(0), trace, mat.mat));
}
public static int TraverseMatrixFromBack(Helfer.Matrix <int> mat)
{
for (int index = mat.Length - 2; index >= 0; index--)
{
int botEl = mat.GetRow(index) == mat.RowNum - 1 ? int.MaxValue : mat.GetElement(mat.GetRow(index) + 1, mat.GetCol(index)); // If LAST ROW: int.Max ELSE: take bottom element
int rightEl = mat.GetCol(index) == mat.ColNum - 1 ? int.MaxValue : mat.GetElement(mat.GetRow(index), mat.GetCol(index) + 1); // If LAST COL: int.Max ELSE: take right element
mat.SetElementAtIndex(index, mat.GetElementAtIndex(index) + Math.Min(botEl, rightEl)); // Add smaller accumulated element to current
// This means it goes along the path with the smaller sum
// The smaller sum accumulates along the path
}
return(mat.GetElementAtIndex(0));
}
