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Hello Codeforces!
I was solving this problem and came up with an approach using set. I made submission but got TLE. If I am correct, time complexity of this submission is nlogn as total number of insert/erase operations in set is O(n) and logn for each upper_bound.
I know this approach is not the best one but considering constraints given in the problem, this should get an AC.
Try replacing
upper_bound(all(st0), p)withst0.upper_bound(p).After this modification the code still TLEs, but this time on Test Case 11 instead of Test Case 10. I'm curious though, why did this change make the code faster?
I used
sync_with_stdio(false); cin.tie(nullptr)and it got AC.Thanks dorijanlendvaj as my solution got AC. As I understood, using upper_bound requires iterators to be incremented randomly which is O(n) in sets. But set.upper_bound does increment iterators by 1 and uses BST like search so is logn.