1019. A Line painting.
Sweep algorithm. Simple geometry.
1010. Discrete Function.
Simple ad-hoc problem.
1026. Questions and answers.
Radix sort.
1025. Democracy in danger.
Simple ad-hoc problem.
1024. Permutations.
Cycle lengths of permutation. LCM and GCD.
1023. Buttons.
Simple math and simple game theory.
1022. Genealogical tree.
Just do topological sort of the directed graph.
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