ID Problem Show tags Hide tags AC / Tried Difficulty
1855 P2A   Winner 0 / 0 (None)
1856 P2B   The least round way 0 / 0 (None)
1857 P3A   Shortest path of the king 0 / 0 (None)
1858 P3C   Tic-tac-toe 0 / 0 (None)
1859 P4A   Watermelon 0 / 0 (None)
1860 P4C   Registration system 0 / 0 (None)
1861 P4D   Mysterious Present 1 / 1 10
1862 P5B   Center Alignment 0 / 0 (None)
1863 P5C   Longest Regular Bracket Sequence 0 / 0 (None)
1864 P5E   Bindian Signalizing 0 / 0 (None)
1865 P6B   President's Office 0 / 0 (None)
1866 P6D   Lizards and Basements 2 0 / 0 (None)
1867 P7A   Kalevitch and Chess 0 / 0 (None)
1868 P7B   Memory Manager 0 / 0 (None)
1869 P7D   Palindrome Degree 0 / 0 (None)
1870 P8A   Train and Peter 0 / 0 (None)
1871 P8B   Obsession with Robots 0 / 0 (None)
1872 P8D   Two Friends 0 / 0 (None)
1873 P8E   Beads 0 / 0 (None)
1874 P9B   Running Student 0 / 0 (None)

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