public void LazySumSegmentTree_ForRandomOperations()
{
var rand = new Random();
for (int a = 0; a < _sourceArrays.Length; ++a)
{
var sourceArray = _sourceArrays[a];
var lazySumSegmentTree = new LazySumSegmentTree(sourceArray);
var arrayBasedSegmentTree = new ArrayBasedSegmentTree <SumQueryObject, int>(sourceArray);
for (int r = 0; r < 1000; ++r)
{
int firstIndex = rand.Next(0, sourceArray.Length);
int secondIndex = rand.Next(0, sourceArray.Length);
int startIndex = Math.Min(firstIndex, secondIndex);
int endIndex = Math.Max(firstIndex, secondIndex);
int mode = rand.Next(2);
if (mode == 0)
{
NaiveSegmentTreeAlternatives.Update(sourceArray, startIndex, endIndex, x => x + r);
lazySumSegmentTree.Update(startIndex, endIndex, rangeAddition: r);
arrayBasedSegmentTree.Update(startIndex, endIndex, x => x + r);
}
else
{
int expected = NaiveSegmentTreeAlternatives.SumQuery(sourceArray, startIndex, endIndex);
Assert.AreEqual(expected, lazySumSegmentTree.SumQuery(startIndex, endIndex));
Assert.AreEqual(expected, arrayBasedSegmentTree.Query(startIndex, endIndex));
}
}
}
}
private void VerifiesUpdates <TQueryObject>(Func <IReadOnlyList <int>, int, int, int> naiveVerifier)
where TQueryObject : SegmentTreeQueryObject <TQueryObject, int>, new()
{
Func <int, int> updater = x => x + 1;
for (int a = 0; a < _sourceArrays.Length; ++a)
{
var sourceArray = _sourceArrays[a];
var nodeBasedSegmentTree = new NodeBasedSegmentTree <TQueryObject, int>(sourceArray);
var arrayBasedSegmentTree = new ArrayBasedSegmentTree <TQueryObject, int>(sourceArray);
var nonRecursiveSegmentTree = new NonRecursiveSegmentTree <TQueryObject, int>(sourceArray);
for (int i = 0; i < sourceArray.Length; ++i)
{
for (int j = i; j < sourceArray.Length; ++j)
{
NaiveSegmentTreeAlternatives.Update(sourceArray, i, j, updater);
nodeBasedSegmentTree.Update(i, j, updater);
arrayBasedSegmentTree.Update(i, j, updater);
nonRecursiveSegmentTree.Update(i, j, updater);
int expected = naiveVerifier(sourceArray, i, j);
Assert.AreEqual(expected, nodeBasedSegmentTree.Query(i, j));
Assert.AreEqual(expected, arrayBasedSegmentTree.Query(i, j));
Assert.AreEqual(expected, nonRecursiveSegmentTree.Query(i, j));
}
}
}
}
