chumong

identical is same object, use == equivalent is same information, use equals()

- solve sub-problem - store and reuse result - bottom up https://leetcode.com/problems/delete-operation-for-two-strings/description/

http://www.yes24.com/24/goods/57658900?scode=032&OzSrank=2 생각보단 가볍게 읽게 되는 책. "아웃풋에 능숙한 사람은 사람을 끌어들이는 힘을 갖는다."

ERROR ..... o.h.e.jdbc.spi.SqlExceptionHelper - Duplicate entry '167-0' for key 'UKdg43ia27ypo1jovw2x64vbwv8' ..... WARN  2018-02-22 21:48:14 [EventProcessor[...]-0] o.a.e.TrackingEventProcessor - Error occurred. Starting retry mode. org.axonframework.eventsourcing.eventstore.EventStoreException: An event for aggregate [167] at sequence [0] could not be persisted at org.axonframework.eventsourcing.eventstore.AbstractEventStorageEngine.handlePersistenceException(AbstractEventStorageEngine.java:139) at org.axonframework.eventsourcing.eventstore.jpa.JpaEventStorageEngine.appendEvents(JpaEventStorageEngine.java:365) at org.axonframework.eventsourcing.eventstore.AbstractEventStorageEngine.appendEvents(AbstractEventStorageEngine.java:112) at org.axonframework.eventsourcing.eventstore.AbstractEventStore.prepareCommit(AbstractEventStore.java:64) at org.axonframework.eventhandling.AbstractEventBus.doWithEvents(AbstractEventBus.java:209) at org.axonframework.event...

which -- locate a program file in the user's path