Hey everyone.Hope u all are doing fine.I need a little help as I am stuck at one particular rating.I am generally able to solve problems upto 1300 level although the math ones do take time.I have knowledge about basic data structures such as array, map,vector,string and set and use a bit of C++ stl but I do not have any idea about any higher data structure or algorithm such as graph tree or dp. I just know their names as I frequently see their name in the editorial:) Can someone tell me what to learn now and then how to proceed further.I really want to improve but am just unable to solve the 1400 tag questions.