|  | 44 | 44
  蚯蚓 | 61 / 122 | 4 | 
      
        |  | 64 | 64
  双栈排序 | 5 / 64 | 9 | 
      
        |  | 94 | 94
  奇怪的数独 | 46 / 139 | 6 | 
      
        |  | 95 | 95
  虫食算 | 52 / 88 | 2 | 
      
        |  | 96 | 96
  玛雅游戏 | 14 / 23 | 5 | 
      
        |  | 101 | 101
  字串变换 | 48 / 343 | 8 | 
      
        |  | 111 | 111
  Hankson的趣味题 | 17 / 32 | 4 | 
      
        |  | 114 | 114
  同余方程 | 32 / 67 | 4 | 
      
        |  | 122 | 122
  计算系数 | 21 / 38 | 3 | 
      
        |  | 144 | 144
  换教室 | 11 / 11 | 7 | 
      
        |  | 168 | 168
  关押罪犯 | 21 / 44 | 4 | 
      
        |  | 186 | 186
  传纸条 | 44 / 77 | 3 | 
      
        |  | 206 | 206
  开车旅行 | 1 / 2 | 10 | 
      
        |  | 222 | 222
  乌龟棋 | 57 / 91 | 2 | 
      
        |  | 251 | 251
  最优贸易 | 8 / 8 | 9 | 
      
        |  | 261 | 261
  树网的核 | 1 / 21 | 10 | 
      
        |  | 264 | 264
  天天爱跑步 | 1 / 3 | 10 | 
      
        |  | 267 | 267
  疫情控制 | 5 / 20 | 8 | 
      
        |  | 364 | 364
  数的划分 | 50 / 141 | 5 | 
      
        |  | 475 | 475
  加分二叉树 | 37 / 56 | 2 | 
      
        |  | 544 | 544
  你要乘坐的飞碟在这里-Your Ride Is Here | 31 / 87 | 5 | 
      
        |  | 545 | 545
  贪婪的送礼者Greedy Gift Givers | 11 / 22 | 6 | 
      
        |  | 546 | 546
  黑色星期五Friday the Thirteenth | 8 / 10 | 9 | 
      
        |  | 547 | 547
  坏掉的项链Broken Necklace | 26 / 65 | 5 | 
      
        |  | 548 | 548
  挤牛奶Milking Cows | 4 / 5 | 10 | 
      
        |  | 549 | 549
  方块转换 Transformations | 3 / 3 | 10 | 
      
        |  | 550 | 550
  命名那个数字 Name That Number | 0 / 32 | 10 | 
      
        |  | 551 | 551
  回文平方数 Palindromic Squares | 8 / 14 | 8 | 
      
        |  | 552 | 552
  双重回文数 Dual Palindromes | 0 / 0 | (无) | 
      
        |  | 553 | 553
  混合牛奶 Mixing Milk | 20 / 156 | 8 | 
      
        |  | 554 | 554
  修理牛棚 Barn Repair | 42 / 93 | 4 | 
      
        |  | 555 | 555
  最长的回文 Calf Flac | 1 / 2 | 10 | 
      
        |  | 556 | 556
  牛式 Prime Cryptarithm | 5 / 5 | 10 | 
      
        |  | 557 | 557
  时钟 The Clocks | 0 / 4 | 10 | 
      
        |  | 558 | 558
  铺放矩形块 Packing Rectangles | 0 / 0 | (无) | 
      
        |  | 559 | 559
  等差数列 Arithmetic Progressions | 2 / 6 | 10 | 
      
        |  | 560 | 560
  母亲的牛奶 Mother's Milk | 2 / 2 | 10 | 
      
        |  | 561 | 561
  数字三角形 Number Triangles | 225 / 638 | 5 | 
      
        |  | 562 | 562
  回文质数 Prime Palindromes | 10 / 31 | 6 | 
      
        |  | 563 | 563
  特殊的质数肋骨 Superprime Rib | 3 / 4 | 10 | 
      
        |  | 564 | 564
  跳棋的挑战 Checker Challenge | 8 / 28 | 7 | 
      
        |  | 565 | 565
  城堡 The Castle | 6 / 24 | 8 | 
      
        |  | 566 | 566
  顺序的分数 Ordered Fractions | 1 / 1 | 10 | 
      
        |  | 567 | 567
  三值的排序 Sorting a Three-Valued Sequence | 4 / 6 | 10 | 
      
        |  | 568 | 568
  健康的荷斯坦奶牛 Healthy Holsteins | 12 / 16 | 6 | 
      
        |  | 569 | 569
  海明码 Hamming Codes | 63 / 151 | 5 | 
      
        |  | 570 | 570
  序言页码 Preface Numbering | 1 / 1 | 10 | 
      
        |  | 571 | 571
  集合 Subset Sums | 3 / 3 | 10 | 
      
        |  | 572 | 572
  循环数 Runaround Numbers | 2 / 5 | 10 | 
      
        |  | 573 | 573
  派对灯 Party Lamps | 3 / 4 | 10 | 
      
        |  | 574 | 574
  最长前缀 Longest Prefix | 2 / 6 | 10 | 
      
        |  | 575 | 575
  奶牛家谱 Cow Pedigrees | 11 / 16 | 7 | 
      
        |  | 576 | 576
  和为零 Zero Sum | 4 / 4 | 10 | 
      
        |  | 577 | 577
  货币系统 Money Systems | 78 / 219 | 5 | 
      
        |  | 578 | 578
  控制公司 Controlling Companies | 1 / 2 | 10 | 
      
        |  | 579 | 579
  两只塔姆沃斯牛 The Tamworth Two | 1 / 2 | 10 | 
      
        |  | 580 | 580
  穿越栅栏 Overfencing | 1 / 7 | 10 | 
      
        |  | 581 | 581
  回家 Bessie Come Home | 1 / 1 | 10 | 
      
        |  | 582 | 582
  牛的旅行 Cow Tours | 4 / 4 | 10 | 
      
        |  | 583 | 583
  分数化小数 Fractions to Decimals | 1 / 1 | 10 | 
      
        |  | 584 | 584
  最短网络Agri-Net | 19 / 30 | 3 | 
      
        |  | 585 | 585
  总分 Score Inflation | 37 / 81 | 4 | 
      
        |  | 586 | 586
  丑数 Humble Numbers | 2 / 4 | 10 | 
      
        |  | 587 | 587
  形成的区域 Shaping Regions | 1 / 1 | 10 | 
      
        |  | 588 | 588
  联系 Contact | 0 / 1 | 10 | 
      
        |  | 589 | 589
  邮票 Stamps | 17 / 57 | 6 | 
      
        |  | 590 | 590
  阶乘 Factorials | 2 / 12 | 10 | 
      
        |  | 591 | 591
  串 Stringsobits01 | 0 / 0 | (无) | 
      
        |  | 592 | 592
  纺车的轮子 Spinning Wheels | 3 / 3 | 10 | 
      
        |  | 593 | 593
  饲料调配 Feed Ratios | 1 / 1 | 10 | 
      
        |  | 594 | 594
  魔板 Magic Squares | 1 / 1 | 10 | 
      
        |  | 595 | 595
  香甜的黄油 Sweet Butter | 5 / 28 | 8 | 
      
        |  | 596 | 596
  骑马修栅栏 Riding the Fences | 23 / 161 | 8 | 
      
        |  | 597 | 597
  商店购物 Shopping Offers | 0 / 0 | (无) | 
      
        |  | 598 | 598
  亚瑟王的宫殿 Camelot | 0 / 2 | 10 | 
      
        |  | 599 | 599
  家的范围 Home on the Range | 6 / 6 | 10 | 
      
        |  | 600 | 600
  游戏 A Game | 0 / 1 | 10 | 
      
        |  | 601 | 601
  闭合的栅栏 Closed Fences | 0 / 1 | 10 | 
      
        |  | 602 | 602
  美国血统 American Heritage | 20 / 29 | 3 | 
      
        |  | 603 | 603
  电网 Electric Fences | 0 / 0 | (无) | 
      
        |  | 604 | 604
  “破锣摇滚”乐队  Raucous Rockers | 0 / 0 | (无) | 
      
        |  | 605 | 605
  麦香牛块 Beef McNuggets | 2 / 2 | 10 | 
      
        |  | 606 | 606
  栅栏的木料 Fence Rails | 2 / 4 | 10 | 
      
        |  | 607 | 607
  篱笆回路 Fence Loops | 2 / 8 | 10 | 
      
        |  | 608 | 608
  解密牛语 Cryptcowgraphy | 0 / 4 | 10 | 
      
        |  | 609 | 609
  草地排水 Drainage Ditches | 1 / 1 | 10 | 
      
        |  | 610 | 610
  完美的牛栏 The Perfect Stall | 0 / 3 | 10 | 
      
        |  | 611 | 611
  工序安排 Job Processing | 5 / 5 | 10 | 
      
        |  | 612 | 612
  奶牛自行车 Cowcycles | 0 / 0 | (无) | 
      
        |  | 613 | 613
  逢低吸纳 Buy Low, Buy Lower | 35 / 102 | 6 | 
      
        |  | 614 | 614
  素数方阵 The Primes | 2 / 3 | 10 | 
      
        |  | 615 | 615
  街道赛跑 Street Race | 0 / 3 | 10 | 
      
        |  | 616 | 616
  字母游戏 Letter Game | 0 / 1 | 10 | 
      
        |  | 617 | 617
  棋盘游戏 Shuttle Puzzle | 1 / 1 | 10 | 
      
        |  | 618 | 618
  追查坏牛奶 Pollutant Control | 1 / 1 | 10 | 
      
        |  | 619 | 619
  重叠的图像 Frame Up | 0 / 1 | 10 | 
      
        |  | 620 | 620
  圈奶牛 Fencing the Cows | 1 / 2 | 10 | 
      
        |  | 621 | 621
  夜空繁星 Starry Night | 1 / 1 | 10 | 
      
        |  | 622 | 622
  乐曲主题 Musical Themes | 1 / 1 | 10 | 
      
        |  | 623 | 623
  蜗牛的旅行 Snail Trails | 0 / 0 | (无) |