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Combinatorics

Pro.ID   Problem Title Difficulty   Notes
1027    Ignatius and the Princess II Difficulty: 1
1085    Holding Bin-Laden Captive! Difficulty: 1
1100    Trees Made to Order Difficulty: 3
1153    Magic Bitstrings Difficulty: 1
1171    Big Event in HDU Difficulty: 1
1261    字串数 Difficulty: 2
1294    Rooted Trees Problem Difficulty: 4
1398    Square Coins Difficulty: 1
1465    不容易系列之一 Difficulty: 1
1492    The number of divisors(约数) about Humble Numbers Difficulty: 1
1510    White Rectangles Difficulty: 2
1521    排列组合 Difficulty: 2
1570    A C Difficulty: 1
1716    排列2 Difficulty: 1
1799    循环多少次? Difficulty: 2

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