I'm a mediocre coder . I'm just converting the asked question language into code and running them. In every contest I solve 2 to 3 codes which are basic, Doesn't need any special data structures . I want to UP my level by studying advanced data structures and solve above average questions and level up my count from 2-3 questions per contest to 6-7 and also reduce the time complexity. And also tips for approaching Short Challenges would be of great help .What should I do? From where to study and what to study?