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Codeforces Aim Tech Round4 (Div2) D

uva live 7639 Extreme XOR Sum (暴力+二项式)

uva live 7637 Balanced String (贪心)

uva live 7638 Number of Connected Components (并查集)

Codeforces Gym 100269 Dwarf Tower (最短路)

HDU 5172 GTY's gay friends (线段树)

HDU 2709 Sumsets(递推)

HDU 5073 Galaxy (数学)

HDU 5179 beautiful number (数位dp / 暴力打表 / dfs)

bzoj 2002 Bounce 弹飞绵羊(分块)