sequence_test.rb

PER_1 = 20
PER_2 = 35
PER_3 = 45
POOL_SIZE = 10

ids = [*(1..1000)]

a1 = (PER_1 / POOL_SIZE).ceil
a2 = (PER_2 / POOL_SIZE).ceil
a3 = POOL_SIZE - a1 - a2

index_1 = [*(1..a1)]
index_2 = [*(index_1.last+1..index_1.last+a2)]
index_3 = [*(index_2.last+1..POOL_SIZE)]

url_1 = []
url_2 = []
url_3 = []

ids.each do |i|
  # here we are checking ids for redirecting
  remender = i % POOL_SIZE
  url_1 << i if index_1.include? (remender)
  url_2 << i if index_2.include? (remender)
  url_3 << i if (index_3.include? (remender)) || remender == 0
end

puts "*"*50

puts "url_1: #{url_1}"
puts "Count: #{url_1.count}"

puts "*"*50

puts "url_2: #{url_2}"
puts "Count: #{url_2.count}"

puts "*"*50

puts "url_3: #{url_3}"
puts "Count: #{url_3.count}"

puts "*"*50

collected_ids = (url_1 + url_2 + url_3).uniq
remaining_ids = ids - collected_ids
puts "remaining_ids: #{remaining_ids}"
puts "Count: #{remaining_ids.count}"

OUtput:

**************************************************
url_1: [1, 2, 11, 12, 21, 22, 31, 32, 41, 42, 51, 52, 61, 62, 71, 72, 81, 82, 91, 92, 101, 102, 111, 112, 121, 122, 131, 132, 141, 142, 151, 152, 161, 162, 171, 172, 181, 182, 191, 192, 201, 202, 211, 212, 221, 222, 231, 232, 241, 242, 251, 252, 261, 262, 271, 272, 281, 282, 291, 292, 301, 302, 311, 312, 321, 322, 331, 332, 341, 342, 351, 352, 361, 362, 371, 372, 381, 382, 391, 392, 401, 402, 411, 412, 421, 422, 431, 432, 441, 442, 451, 452, 461, 462, 471, 472, 481, 482, 491, 492, 501, 502, 511, 512, 521, 522, 531, 532, 541, 542, 551, 552, 561, 562, 571, 572, 581, 582, 591, 592, 601, 602, 611, 612, 621, 622, 631, 632, 641, 642, 651, 652, 661, 662, 671, 672, 681, 682, 691, 692, 701, 702, 711, 712, 721, 722, 731, 732, 741, 742, 751, 752, 761, 762, 771, 772, 781, 782, 791, 792, 801, 802, 811, 812, 821, 822, 831, 832, 841, 842, 851, 852, 861, 862, 871, 872, 881, 882, 891, 892, 901, 902, 911, 912, 921, 922, 931, 932, 941, 942, 951, 952, 961, 962, 971, 972, 981, 982, 991, 992]
Count: 200
**************************************************
url_2: [3, 4, 5, 13, 14, 15, 23, 24, 25, 33, 34, 35, 43, 44, 45, 53, 54, 55, 63, 64, 65, 73, 74, 75, 83, 84, 85, 93, 94, 95, 103, 104, 105, 113, 114, 115, 123, 124, 125, 133, 134, 135, 143, 144, 145, 153, 154, 155, 163, 164, 165, 173, 174, 175, 183, 184, 185, 193, 194, 195, 203, 204, 205, 213, 214, 215, 223, 224, 225, 233, 234, 235, 243, 244, 245, 253, 254, 255, 263, 264, 265, 273, 274, 275, 283, 284, 285, 293, 294, 295, 303, 304, 305, 313, 314, 315, 323, 324, 325, 333, 334, 335, 343, 344, 345, 353, 354, 355, 363, 364, 365, 373, 374, 375, 383, 384, 385, 393, 394, 395, 403, 404, 405, 413, 414, 415, 423, 424, 425, 433, 434, 435, 443, 444, 445, 453, 454, 455, 463, 464, 465, 473, 474, 475, 483, 484, 485, 493, 494, 495, 503, 504, 505, 513, 514, 515, 523, 524, 525, 533, 534, 535, 543, 544, 545, 553, 554, 555, 563, 564, 565, 573, 574, 575, 583, 584, 585, 593, 594, 595, 603, 604, 605, 613, 614, 615, 623, 624, 625, 633, 634, 635, 643, 644, 645, 653, 654, 655, 663, 664, 665, 673, 674, 675, 683, 684, 685, 693, 694, 695, 703, 704, 705, 713, 714, 715, 723, 724, 725, 733, 734, 735, 743, 744, 745, 753, 754, 755, 763, 764, 765, 773, 774, 775, 783, 784, 785, 793, 794, 795, 803, 804, 805, 813, 814, 815, 823, 824, 825, 833, 834, 835, 843, 844, 845, 853, 854, 855, 863, 864, 865, 873, 874, 875, 883, 884, 885, 893, 894, 895, 903, 904, 905, 913, 914, 915, 923, 924, 925, 933, 934, 935, 943, 944, 945, 953, 954, 955, 963, 964, 965, 973, 974, 975, 983, 984, 985, 993, 994, 995]
Count: 300
**************************************************
url_3: [6, 7, 8, 9, 10, 16, 17, 18, 19, 20, 26, 27, 28, 29, 30, 36, 37, 38, 39, 40, 46, 47, 48, 49, 50, 56, 57, 58, 59, 60, 66, 67, 68, 69, 70, 76, 77, 78, 79, 80, 86, 87, 88, 89, 90, 96, 97, 98, 99, 100, 106, 107, 108, 109, 110, 116, 117, 118, 119, 120, 126, 127, 128, 129, 130, 136, 137, 138, 139, 140, 146, 147, 148, 149, 150, 156, 157, 158, 159, 160, 166, 167, 168, 169, 170, 176, 177, 178, 179, 180, 186, 187, 188, 189, 190, 196, 197, 198, 199, 200, 206, 207, 208, 209, 210, 216, 217, 218, 219, 220, 226, 227, 228, 229, 230, 236, 237, 238, 239, 240, 246, 247, 248, 249, 250, 256, 257, 258, 259, 260, 266, 267, 268, 269, 270, 276, 277, 278, 279, 280, 286, 287, 288, 289, 290, 296, 297, 298, 299, 300, 306, 307, 308, 309, 310, 316, 317, 318, 319, 320, 326, 327, 328, 329, 330, 336, 337, 338, 339, 340, 346, 347, 348, 349, 350, 356, 357, 358, 359, 360, 366, 367, 368, 369, 370, 376, 377, 378, 379, 380, 386, 387, 388, 389, 390, 396, 397, 398, 399, 400, 406, 407, 408, 409, 410, 416, 417, 418, 419, 420, 426, 427, 428, 429, 430, 436, 437, 438, 439, 440, 446, 447, 448, 449, 450, 456, 457, 458, 459, 460, 466, 467, 468, 469, 470, 476, 477, 478, 479, 480, 486, 487, 488, 489, 490, 496, 497, 498, 499, 500, 506, 507, 508, 509, 510, 516, 517, 518, 519, 520, 526, 527, 528, 529, 530, 536, 537, 538, 539, 540, 546, 547, 548, 549, 550, 556, 557, 558, 559, 560, 566, 567, 568, 569, 570, 576, 577, 578, 579, 580, 586, 587, 588, 589, 590, 596, 597, 598, 599, 600, 606, 607, 608, 609, 610, 616, 617, 618, 619, 620, 626, 627, 628, 629, 630, 636, 637, 638, 639, 640, 646, 647, 648, 649, 650, 656, 657, 658, 659, 660, 666, 667, 668, 669, 670, 676, 677, 678, 679, 680, 686, 687, 688, 689, 690, 696, 697, 698, 699, 700, 706, 707, 708, 709, 710, 716, 717, 718, 719, 720, 726, 727, 728, 729, 730, 736, 737, 738, 739, 740, 746, 747, 748, 749, 750, 756, 757, 758, 759, 760, 766, 767, 768, 769, 770, 776, 777, 778, 779, 780, 786, 787, 788, 789, 790, 796, 797, 798, 799, 800, 806, 807, 808, 809, 810, 816, 817, 818, 819, 820, 826, 827, 828, 829, 830, 836, 837, 838, 839, 840, 846, 847, 848, 849, 850, 856, 857, 858, 859, 860, 866, 867, 868, 869, 870, 876, 877, 878, 879, 880, 886, 887, 888, 889, 890, 896, 897, 898, 899, 900, 906, 907, 908, 909, 910, 916, 917, 918, 919, 920, 926, 927, 928, 929, 930, 936, 937, 938, 939, 940, 946, 947, 948, 949, 950, 956, 957, 958, 959, 960, 966, 967, 968, 969, 970, 976, 977, 978, 979, 980, 986, 987, 988, 989, 990, 996, 997, 998, 999, 1000]
Count: 500
**************************************************
remaining_ids: []
Count: 0

@charusat09 This output looks promising but will defer to others that can evaluate the code itself (I am unsure if remender is supposed to be remainder).