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Today I wanted to solve this problem: Heavy Intervals But I got TLE3 code: 260013398. that's why I changed the code a little bit and my code(260014069) was correct. But I don't understand how? Can you explain?
b.upperbound takes $$$O(logn)$$$ while upperbound(all(b), a[i]) takes $$$O(n)$$$ time.
for sets , b.upper_bound is O(log(n)) but upper_bound(all(b)) is O(n)
Using set.upper_bound() is O(log n), while std::upper_bound(set.begin(), set.end(), value) adds O(n) complexity due to linear search, potentially causing time limit.