General-purpose, practical implementation of delay propagation segment trees

• Can be applied for various purposes by defining operations on values and actions
  • Correctly answer the four AOJ questions.
• Check that it works correctly, then deploy inline if it is not fast enough
  • Just one inline deployment in one location to answer the four AOJ questions within the time limit.
• https://github.com/nishio/atcoder/tree/master/memo/segment_tree

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