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- Optimal Insertion(dfs/逆序对)
- Phys Ed Online(单调队列/单调栈/rmq/好题)
- Messages(贪心/思维/数学期望)
- Armor and Weapons(贪心/bfs)
- Not Quite Lee(思维/裴蜀定理/容斥)
- Yet Another Sorting Problem(逆序对/思维)
- Frequency Queries(dfs/离线查询/树状数组/数据结构)
- Non-equal Neighbours(容斥/dp/单调栈/前缀和/好题)
- Peculiar Movie Preferences(字典树/贪心)
- Download More RAM(贪心/排序)