Can some one suggest me what optimization can i further do to my code to pass. My last submission is https://codeforces.me/contest/769/submission/266498431 The problem statement is — https://codeforces.me/contest/769/problem/C Thanks :)

I have done undergradute level courses in data structures. Currently I am comfortable using MAP,SET,PRIORITY_QUEUE,UNORDERED_MAP,UNORDERED_SET,ORDERED_SET,STACK,QUEUE,DEQUEUE. I would like to know what additional data structures should i learn in order to reach CM. Also could you recommend some good resources to learn those. Thanks :)