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Problems

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  ID Title Submit Solved
  1800 Manhattan 2025 24 15
  1801 Mayan Dates 4 3
  1802 Quadratic Residues 60 19
  1803 Regetni 7 6
  1804 Travelling Salesman 2 2
  1805 Pre, in and post 5 5
  1806 Free spots 6 4
  1807 Traffic! 1 1
  1808 Another Game of Tetris 5 0
  1809 Big Big Tree 5 1
  1810 Crazy Savages 9 2
  1811 Denki Blocks 0 0
  1812 Eb Alto Saxophone Player 5 3
  1813 Folding My T-Shirt 6 2
  1814 Gift Exchanging 12 3
  1815 Hyper Toy Soldiers 4 3
  1816 Castle Walls 9 4
  1817 DNA Laboratory 79 14
  1818 Extra Terrestrial PISA Test 25 9
  1819 Heavy Transportation 623 132
  1820 Yeehaa! 750 404
  1821 Intersection is not that Easy 1 1
  1822 The Fun Number System 7 2
  1823 Dividing up 480 146
  1824 The Suspects 485 251
  1825 Points Within 213 54
  1826 Number Sequence 936 260
  1827 Falling 97 22
  1828 Math is so simple 81 23
  1829 Bridge Hands 22 16
  1830 Charlie's Change 72 18
  1831 Building a New Depot 12 11
  1832 Truck History 293 72
  1833 Base Numbers 124 33
  1834 Paper Cutting 6 5
  1835 Hay Points 107 81
  1836 Jogging Trails 54 23
  1837 Beavergnaw 213 171
  1838 Power Strings 577 274
  1839 Relatives 421 220
  1840 Necklace 141 42
  1841 Return of the Jedi 1 1
  1842 Discrete Logging 37 16
  1843 Hardwood Species 70 15
  1844 Forests 80 45
  1845 A Star not a Tree? 17 12
  1846 Combination Lock 152 108
  1847 Basic Remains 219 98
  1848 Genealogical Research 39 14
  1849 Treasure Map 3 1
  1850 Calories from Fat 23 19
  1851 Dead Fraction 43 8
  1852 Biometrics 17 5
  1853 XYZZY 44 12
  1854 Ascend 1132 433
  1855 Sphere Route 78 10
  1856 Chocolates 69 5
  1857 Find the Max NORM 83 26
  1858 Natural Span 136 36
  1859 Cut the Apple 829 313
  1860 Print All 181 13
  1861 Find or Insert 674 198
  1862 Choice Pears 327 152
  1863 Words 123 39
  1864 Binary Trees' Order 72 58
  1865 How many sums? 1305 453
  1866 Games 221 109
  1867 Fiber Communications 124 11
  1868 Power Hungry Cows 81 10
  1869 Cow Cycling 34 11
  1870 Rebuilding Roads 166 64
  1871 Triangular Pastures 161 24
  1872 Coins 234 126
  1873 String to Palindrome 3 3
  1874 Help! 1 1
  1875 Antiarithmetic? 7 5
  1876 The Optimal Super Highway 5 1
  1877 Triangular Square 15 4
  1878 Treequivalence 1 1
  1879 Not the Best 1 1
  1880 Knights Roaming 3 1
  1881 Nature 1 1
  1882 The jackpot 21 12
  1883 Teobaldo's Trip 4 2
  1884 The decadary watch 1 1
  1885 The Grazing Cow 10 8
  1886 Dominant Strings 1 1
  1887 Editor Nottobad 5 2
  1888 SCUD Busters 10 2
  1889 Fence 6 3
  1890 Filling Out the Team 385 238
  1891 GHOST 14 2
  1892 Doggone Moles 23 10
  1893 Line of Sight 60 14
  1894 Tangled in Cables 131 55
  1895 A Contesting Decision 141 110
  1896 Auctions R Us 33 13
  1897 Balanced Budget Initiative 31 2
  1898 Help! 246 115
  1899 Head or Tail 823 589