static int RealEstateBroker(int[][] clients, int[][] houses)
        {
            houses = houses.OrderBy(e => e[0]).ThenBy(e => e[1]).ToArray();
            var getters = Enumerable.Range(0, clients.Length).Select(_ => false).ToArray();
            int res = 0;
            houses.ToList().ForEach(house =>
            {
                var fitters = clients.Select((_, i) => (client: clients[i][1], idx: i))
                    .Where((v, j) => !getters[j] && clients[j][0] < house[0] && v.client >= house[1]).ToArray();
                if (fitters.Any())
                {
                    getters[fitters.OrderBy(e => e.client).ThenBy(e => e.idx).ElementAt(0).idx] = true;
                    res++;
                }
            });
            return res;
        }