/// <summary>
        /// Gets number available routes. Return back to start point in journey is available.
        /// </summary>
        /// <param name="startVertex">
        /// Start point of journey
        /// </param>
        /// <param name="endVertex">
        /// End point of journey
        /// </param>
        /// <param name="limitJourneyTime">
        /// The limit of journey time
        /// </param>
        /// <param name="compareOperationForLimitParam">
        /// Additional param for comparing journey's way with count of the stops
        /// </param>
        /// <returns>
        /// The <see cref="int"/> number of routes.
        /// </returns>
        public int GetNumberRoutesByJourneyTime(Vertex startVertex, Vertex endVertex, double limitJourneyTime, CompareOperationForLimitParam compareOperationForLimitParam)
        {
            GraphHelper graphHelper = new GraphHelper(this);

            return(graphHelper.GetNumberRoutes(startVertex, endVertex, limitJourneyTime, compareOperationForLimitParam));
        }
        /// <summary>
        /// Gets number available routes. Return back to start point in journey is available.
        /// </summary>
        /// <param name="startVertex">
        /// Start point of journey
        /// </param>
        /// <param name="endVertex">
        /// End point of journey
        /// </param>
        /// <param name="limitOfStops">
        /// The stops without start point
        /// </param>
        /// <param name="compareOperationForLimitParam">
        /// Additional param for comparing journey's way with count of the stops
        /// </param>
        /// <returns>
        /// The <see cref="int"/> number of routes.
        /// </returns>
        public int GetNumberRoutesByStops(Vertex startVertex, Vertex endVertex, int limitOfStops, CompareOperationForLimitParam compareOperationForLimitParam)
        {
            GraphHelper graphHelper = new GraphHelper(this);

            return(graphHelper.GetNumberRoutes(startVertex, endVertex, limitOfStops, compareOperationForLimitParam));
        }