4 problems

  • 1
ID Problem Show tags Hide tags AC / Tried Difficulty
777 NOIPS2009A  潜伏者 0 / 0 (None)
778 NOIPS2009B  Hankson 的趣味题 1 / 1 10
779 NOIPS2009C  最优贸易 1 / 13 10
780 NOIPS2009D  靶形数独 3 / 19 9
  • 1

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