Summer training - 8.9 summary

Learning content: the SET

Complete number of questions: 3 questions

Read the case: 6 Ye

 

Do questions Summary:

AcWing 146: https://www.cnblogs.com/buhuiflydepig/p/11326141.html

codeforces 854c：https://www.cnblogs.com/buhuiflydepig/p/11329858.html

 

Experience:

Some do not use STL containers, TLE to autism, vector.erase is O (n), set.erase is O (log _n- ).