01-18 Roadblocks 01-18 路径还原 01-18 string的插入和删除 01-17 string中find()和substr()的用法 01-17 Bellman-Ford 01-17 Elections 01-15 食物链 01-15 next_permutation(begin,end) 01-15 并查集（防退化） 01-15 Two Arrays 01-15 取整 01-14 背包问题 01-14 完全背包问题 01-14 最长公共子序列 01-14 Petya and Exam 01-14 K for the Price of One 01-13 Mafia 01-13 三分 01-12 Molly's Chemicals 01-12 DNA Alignment 01-12 Vasya and Robot 01-12 Monitor 01-12 前缀和 01-12 一维差分和二维差分 01-11 Median on Segments (Permutations Edition) 01-11 Polycarp and Div 3 01-11 Dr. Evil Underscores 01-08 Garland 01-07 Hyperset 01-07 Portals 01-06 New Year and Permutation 01-04 Common Number