public static void ConstructSegTreeTest_Array_Power_Of_2()
        {
            var segTree = new SegmentTree();
            var arr     = new[] { 1, 2, 3, 4, 5, 6, 7, 8 };
            var size    = segTree.FindSegmentTreeSize(arr.Length);
            var segArr  = new int[2 * size - 1];

            segTree.ConstructSegTree(segArr, arr, 0, arr.Length - 1, 0);

            //Assert
            Assert.AreEqual(36, segArr[0]);
        }