| | |
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| Problem ID | Title | Ratio(AC/Submit) | Difficulty | Date |
| 1700 | Tournament 29 September, 2007 - Waterloo local contest | 0%(0/4) | 100% | 2017-11-17 |
| 1701 | Wedding 29 September, 2007 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1702 | Problem A:The Trip, 2007 24 September, 2006 - Waterloo local contest | 0%(0/1) | 100% | 2014-01-08 |
| 1703 | Mall Mania 24 September, 2006 - Waterloo local contest | 0%(0/2) | 100% | 2014-01-08 |
| 1704 | Moonshine 24 September, 2006 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1705 | WFF 24 September, 2006 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1706 | Cousins 24 September, 2006 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1707 | Problem A:Semi-prime H-numbers 30 September, 2006 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1708 | Rectilinear polygon 30 September, 2006 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1709 | Life Forms 30 September, 2006 - Waterloo local contest | 31%(28/90) | 69% | 2018-06-17 |
| 1710 | Tautology 30 September, 2006 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1711 | Rinse 30 September, 2006 - Waterloo local contest | 0%(0/1) | 100% | 2013-01-01 |
| 1712 | Problem A:Open Source 14 July, 2007 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1713 | Antimonotonicity 14 July, 2007 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1714 | Humidex 14 July, 2007 - Waterloo local contest | 75%(3/4) | 25% | 2017-06-11 |
| 1715 | Tour de France 14 July, 2007 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1716 | Texas Trip 14 July, 2007 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1717 | Problem A:Trainsorting 15 June, 2008 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1718 | Classified 15 June, 2008 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1719 | Hot Spot 15 June, 2008 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1720 | Snakes and Ladders 15 June, 2008 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1721 | Balance 15 June, 2008 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1722 | Problem A:Exchange Rates 23 September, 2007 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1723 | Conformity 23 September, 2007 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1724 | Pseudoprime numbers 23 September, 2007 - Waterloo local contest | 100%(1/1) | 0% | 2017-08-18 |
| 1725 | Carpool 23 September, 2007 - Waterloo local contest | 100%(1/1) | 0% | 2015-01-26 |
| 1726 | Friend or Foe? 23 September, 2007 - Waterloo local contest | 0%(0/3) | 100% | 2015-01-26 |
| 1727 | Problem A:Laurel Creek 27 September, 2008 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1728 | Rocket Stages 27 September, 2008 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1729 | Virtual Friends 27 September, 2008 - Waterloo local contest | 30%(12/40) | 70% | 2017-08-24 |
| 1730 | Dominos 27 September, 2008 - Waterloo local contest | 16%(15/96) | 84% | 2018-09-30 |
| 1731 | Logo 27 September, 2008 - Waterloo local contest | 31%(8/26) | 69% | 2018-10-01 |
| 1732 | Problem A:Cranes 4 October, 2008 - Waterloo local contest | 29%(2/7) | 71% | 2018-06-15 |
| 1733 | WiFi 4 October, 2008 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1734 | 算法：Exact Change(背包) 4 October, 2008 - Waterloo local contest | 67%(4/6) | 33% | 2019-04-09 |
| 1735 | Dominos 2 4 October, 2008 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1736 | Logo 2 4 October, 2008 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1737 | Problem A:Tic Tac Toe 13 June, 2009 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1738 | Fire! 13 June, 2009 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1739 | Nice Prefixes 13 June, 2009 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1740 | Convex Hull 13 June, 2009 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1741 | Slalom 13 June, 2009 - Waterloo local contest | 100%(1/1) | 0% | 2011-04-03 |
| 1742 | Problem A:MC part deux 27 September, 2009 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1743 | Moveable maze 27 September, 2009 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1744 | Pick up sticks 27 September, 2009 - Waterloo local contest | 69%(9/13) | 31% | 2018-10-01 |
| 1745 | Digits 27 September, 2009 - Waterloo local contest | 30%(12/40) | 70% | 2018-10-01 |
| 1746 | Rotate to root 27 September, 2009 - Waterloo local contest | 0%(0/0) | 100% | 2010-08-15 |
| 1747 | Problem A:Alphacode East Central North America 2004 | 27%(3/11) | 73% | 2010-08-22 |
| 1748 | Anti-prime Sequences East Central North America 2004 | 20%(1/5) | 80% | 2010-08-22 |
| 1749 | Hit or Miss East Central North America 2004 | 33%(2/6) | 67% | 2010-08-22 |
| 1750 | I Conduit! East Central North America 2004 | 0%(0/0) | 100% | 2010-08-22 |
| 1751 | Roll Playing Games East Central North America 2004 | 0%(0/0) | 100% | 2010-11-02 |
| 1752 | Team Rankings East Central North America 2004 | 100%(1/1) | 0% | 2010-08-22 |
| 1753 | To and Fro East Central North America 2004 | 46%(6/13) | 54% | 2018-10-01 |
| 1754 | Translations East Central North America 2004 | 0%(0/0) | 100% | 2010-08-22 |
| 1755 | Problem A:Crypto Columns East Central North America 2003 | 0%(0/0) | 100% | 2010-08-22 |
| 1756 | Decorations East Central North America 2003 | 0%(0/0) | 100% | 2010-08-22 |
| 1757 | EKG Sequence East Central North America 2003 | 0%(0/0) | 100% | 2010-08-22 |
| 1758 | Phone Home East Central North America 2003 | 0%(0/0) | 100% | 2010-08-22 |
| 1759 | Polly Nomials East Central North America 2003 | 0%(0/0) | 100% | 2010-08-22 |
| 1760 | Pushing Boxes East Central North America 2003 | 0%(0/0) | 100% | 2010-08-22 |
| 1761 | Squadtrees East Central North America 2003 | 0%(0/0) | 100% | 2010-08-22 |
| 1762 | This Takes the Cake East Central North America 2003 | 0%(0/0) | 100% | 2010-08-22 |
| 1763 | Problem A:Ball Toss East Central North America 2002 | 0%(0/0) | 100% | 2010-08-22 |
| 1764 | Galactic Breakup East Central North America 2002 | 0%(0/0) | 100% | 2010-08-22 |
| 1765 | Increasing Sequences East Central North America 2002 | 0%(0/0) | 100% | 2010-08-22 |
| 1766 | Pre-Post-erous! East Central North America 2002 | 0%(0/0) | 100% | 2010-08-22 |
| 1767 | Knockout Tournament East Central North America 2002 | 0%(0/0) | 100% | 2010-11-02 |
| 1768 | Plugged In East Central North America 2002 | 0%(0/0) | 100% | 2010-08-22 |
| 1769 | One Person East Central North America 2002 | 0%(0/0) | 100% | 2010-08-22 |
| 1770 | Slots of Fun East Central North America 2002 | 0%(0/0) | 100% | 2010-08-22 |
| 1771 | Problem A:Calendar Game Taejon 2001 | 100%(1/1) | 0% | 2017-09-21 |
| 1772 | Wooden Sticks Taejon 2001 | 0%(0/0) | 100% | 2010-08-22 |
| 1773 | Modular multiplication of polynomials Taejon 2001 | 0%(0/0) | 100% | 2010-08-22 |
| 1774 | Human Gene Functions Taejon 2001 | 0%(0/0) | 100% | 2010-08-22 |
| 1775 | Flip and Shift Taejon 2001 | 0%(0/0) | 100% | 2010-08-22 |
| 1776 | Moving Tables Taejon 2001 | 64%(7/11) | 36% | 2018-10-01 |
| 1777 | Farmland Taejon 2001 | 0%(0/0) | 100% | 2010-08-22 |
| 1778 | Square Destroyer Taejon 2001 | 0%(0/0) | 100% | 2010-08-22 |
| 1779 | Problem A: Shopping 10 July, 2010 - Waterloo local contest | 0%(0/3) | 100% | 2010-09-06 |
| 1780 | Stack Machine 10 July, 2010 - Waterloo local contest | 43%(3/7) | 57% | 2010-09-06 |
| 1781 | Ideas 10 July, 2010 - Waterloo local contest | 100%(1/1) | 0% | 2010-09-04 |
| 1782 | HST 10 July, 2010 - Waterloo local contest | 0%(0/17) | 100% | 2010-09-06 |
| 1783 | Tunnelling the Earth 10 July, 2010 - Waterloo local contest | 38%(3/8) | 62% | 2018-10-01 |
| 1784 | Problem A:Nth Largest Value 2009 Greater New York Regional | 73%(57/78) | 27% | 2018-12-19 |
| 1785 | Equal Sum Partitions 2009 Greater New York Regional | 100%(5/5) | 0% | 2018-10-14 |
| 1786 | Balls 2009 Greater New York Regional | 80%(4/5) | 20% | 2018-10-14 |
| 1787 | Running Median 2009 Greater New York Regional | 28%(34/121) | 72% | 2018-10-15 |
| 1788 | The Next Permutation 2009 Greater New York Regional | 43%(6/14) | 57% | 2018-10-14 |
| 1789 | Adjacent Bit Counts 2009 Greater New York Regional | 60%(3/5) | 40% | 2018-10-14 |
| 1790 | Convex Hull of Lattice Points 2009 Greater New York Regional
| 0%(0/0) | 100% | 2010-08-29 |
| 1791 | Interior Points of Lattice Polygons 2009 Greater New York Regional | 100%(1/1) | 0% | 2010-08-29 |
| 1792 | Theta Puzzle 2009 Greater New York Regional | 18%(4/22) | 82% | 2018-10-19 |
| 1793 | 算法：Catalan数 | 30%(102/340) | 70% | 2019-04-09 |
| 1794 | 算法:x^n | 33%(691/2093) | 67% | 2019-04-02 |
| 1795 | 矩阵乘法 | 62%(21/34) | 38% | 2018-10-01 |
| 1796 | 约数的个数 | 33%(477/1464) | 67% | 2018-12-01 |
| 1797 | 改写程序 | 54%(137/253) | 46% | 2019-01-04 |
| 1798 | 打鱼晒网问题 | 25%(106/418) | 75% | 2018-11-26 |
| 1799 | 骨牌铺方格III | 43%(62/145) | 57% | 2019-04-19 |
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