| 
          
         | 
        1801 | 
                
              P2791
  Area 51
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1802 | 
                
              P2792
  Brackets Removal
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1803 | 
                
              P2793
  Cactus
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1804 | 
                
              P2794
  Double Patience
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1805 | 
                
              P2795
  Exploring Pyramids
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1806 | 
                
              P2796
  Feel Good
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1807 | 
                
              P2797
  Guards
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1808 | 
                
              P2798
  Hardwood Cutting
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1809 | 
                
              P2799
  IP Networks
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1810 | 
                
              P2800
  Joseph's Problem
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1811 | 
                
              P2801
  Knockdown
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1812 | 
                
              P2802
  Plinko
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1813 | 
                
              P2803
  Defining Moment
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1814 | 
                
              P2804
  Jetpack Sniper 3000 Fragfest Extreme
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1815 | 
                
              P2805
  Pegs
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1816 | 
                
              P2806
  Janken Tactics
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1817 | 
                
              P2807
  Bingo!
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1818 | 
                
              P2808
  Artificial Strife
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1819 | 
                
              P2809
  It's My Derivative
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1820 | 
                
              P2810
  Take Your Vitamins
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1821 | 
                
              P2811
  Packing Dominoes
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1822 | 
                
              P2812
  Extrusion
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1823 | 
                
              P2813
  Pasting Strings
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1824 | 
                
              P2814
  Mobiles
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1825 | 
                
              P2815
  Context-Free Clock
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1826 | 
                
              P2816
  Right-Hand Rule
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1827 | 
                
              P2817
  WordStack
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1828 | 
                
              P2818
  Making Change
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1829 | 
                
              P2819
  TN's Kingdom I - Establishment
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1830 | 
                
              P2820
  TN's Kingdom II - Construction
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1831 | 
                
              P2821
  TN's Kingdom III - Assassination
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1832 | 
                
              P2822
  TN's Kingdom IV - Collapse
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1833 | 
                
              P2823
  Sliding Window
         | 
        0 / 1 | 
        10 | 
      
      
        | 
          
         | 
        1834 | 
                
              P2824
  Bohemian Rhapsody
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1835 | 
                
              P2825
  Perfect Permutation
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1836 | 
                
              P2826
  An Easy Problem?!
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1837 | 
                
              P2827
  Auto-Calculation Machine
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1838 | 
                
              P2828
  Buy Tickets
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1839 | 
                
              P2829
  How Many Free Dimensions?
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1840 | 
                
              P2830
  Max Sequence II
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1841 | 
                
              P2831
  Can We Build This One?
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1842 | 
                
              P2832
  How Many Pairs?
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1843 | 
                
              P2833
  The Average
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1844 | 
                
              P2834
  Where Are You?
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1845 | 
                
              P2835
  Sunzi's Problem
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1846 | 
                
              P2836
  Rectangular Covering
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1847 | 
                
              P2837
  Silver Matrix
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1848 | 
                
              P2838
  Graph Connectivity
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1849 | 
                
              P2839
  Convex Hull and Triangle
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1850 | 
                
              P2840
  Big Clock
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1851 | 
                
              P2841
  Navigation Game
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1852 | 
                
              P2842
  N-dimension Matching
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1853 | 
                
              P2843
  Cutting Cake
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1854 | 
                
              P2844
  Sum and Product
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1855 | 
                
              P2845
  01000001
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1856 | 
                
              P2846
  The Bank of Kalii
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1857 | 
                
              P2847
  The Cubic End
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1858 | 
                
              P2848
  Kindergarten Graduation
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1859 | 
                
              P2849
  brainf*ck
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1860 | 
                
              P2850
  Stacking Cylinders
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1861 | 
                
              P2851
  No Fold'em Hold'em
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1862 | 
                
              P2852
  Model Rocket Height
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1863 | 
                
              P2853
  Sequence Sum Possibilities
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1864 | 
                
              P2854
  Educational Journey
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1865 | 
                
              P2855
  Go
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1866 | 
                
              P2856
  Medals
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1867 | 
                
              P2857
  Flipping Colors
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1868 | 
                
              P2858
  Crabbles
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1869 | 
                
              P2859
  A rectangle
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1870 | 
                
              P2860
  Block game with the Little Prince
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1871 | 
                
              P2861
  Cycle with 6 vertices
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1872 | 
                
              P2862
  Tornado!
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1873 | 
                
              P2863
  Mission Impossible
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1874 | 
                
              P2864
  Pascal Library
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1875 | 
                
              P2865
  ICPC Strikes Again
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1876 | 
                
              P2866
  Optical Fiber
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1877 | 
                
              P2867
  Where Are My Genes
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1878 | 
                
              P2868
  Computer DJ
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1879 | 
                
              P2869
  P-Networks
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1880 | 
                
              P2870
  Light Up
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1881 | 
                
              P2871
  A Simple Question of Chemistry
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1882 | 
                
              P2872
  Spelling Be
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1883 | 
                
              P2873
  Apply a Cold Compress
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1884 | 
                
              P2874
  A Baron Landscape
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1885 | 
                
              P2875
  In Defence of a Garden
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1886 | 
                
              P2876
  Cantoring Along
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1887 | 
                
              P2877
  Chambers Ceramic Conundrum
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1888 | 
                
              P2878
  IOI Photos
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1889 | 
                
              P2879
  Vice City
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1890 | 
                
              P2880
  Fixing Codes
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1891 | 
                
              P2881
  Wiping Words
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1892 | 
                
              P2882
  Food Cubes
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1893 | 
                
              P2883
  Points
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1894 | 
                
              P2884
  ACM-Telecom
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1895 | 
                
              P2885
  Prince of Persia
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1896 | 
                
              P2886
  Who Gets the Most Candies?
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1897 | 
                
              P2887
  Big String
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1898 | 
                
              P2888
  Magic Bracelet
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1899 | 
                
              P2889
  Unique Solution
         | 
        0 / 0 | 
        (无) | 
      
      
        | 
          
         | 
        1900 | 
                
              P2890
  Matrix Multiplication
         | 
        0 / 0 | 
        (无) |