https://leetcode.com/problems/two-best-non-overlapping-events/description/

Max two non-overlapping intervals #medium #binary_search

https://leetcode.com/problems/special-array-ii/description/

Queries is all adjucents parity differ [i..j] #medium #two_pointers

https://leetcode.com/problems/find-longest-special-substring-that-occurs-thrice-i/description/

Max same-char 3-windows length #medium #sliding_window

https://leetcode.com/problems/maximum-beauty-of-an-array-after-applying-operation/description/


Max equal nums after adjusting to [-k..+k] #medium #binary_search #line_sweep

https://leetcode.com/problems/take-gifts-from-the-richest-pile/description/

Sum after k-Sqrt of tops in array #easy

https://leetcode.com/problems/find-score-of-an-array-after-marking-all-elements/description/

Sum of minimums in order excluding siblings #medium #monotonic_stack

https://leetcode.com/problems/continuous-subarrays/description/

Count subarrays with difference <= 2 #medium #monotonic_queue #tree_set

https://leetcode.com/problems/maximum-average-pass-ratio/description/

Arrange passed students to improve average score #medium #heap

https://leetcode.com/problems/final-array-state-after-k-multiplication-operations-i/description/

Mutliply k minimums #easy

https://leetcode.com/problems/construct-string-with-repeat-limit/description/


Max lexical ordered with repeat_limit string #medium #bucket_sort

https://leetcode.com/problems/final-prices-with-a-special-discount-in-a-shop/description/

Subtract next smaller value #easy #monotonic_stack

https://leetcode.com/problems/max-chunks-to-make-sorted/description/

Maximum independent chunks to merge-sort array #medium

https://leetcode.com/problems/reverse-odd-levels-of-binary-tree/description/

Odd-levels reversal in a perfect tree #medium #dfs #bfs #tree

https://leetcode.com/problems/maximum-number-of-k-divisible-components/description/

Max connected components divisible by k in graph #hard #toposort

https://leetcode.com/problems/find-building-where-alice-and-bob-can-meet/description/

Common indices t, h[t] > h[a], h[t] > h[b] for queries q[][a,b] #hard #monotonic_stack

https://leetcode.com/problems/minimum-number-of-operations-to-sort-a-binary-tree-by-level/description/


Min swaps to sort tree layers #medium #cycle-sort #bfs

https://leetcode.com/problems/find-minimum-diameter-after-merging-two-trees/description/

Diameter of 2 connected trees #hard #graph #toposort

https://leetcode.com/problems/find-largest-value-in-each-tree-row/description/

Tree layers maxes #medium

https://leetcode.com/problems/target-sum/description/


Count signs permutations to sum equal target #medium #dynamic_programming

https://leetcode.com/problems/best-sightseeing-pair/description/

Max (a[i] + a[j] + i - j), i > j #medium #arithmetics

https://leetcode.com/problems/maximum-sum-of-3-non-overlapping-subarrays/description/


3 max non-intersecting intervals #hard #dynamic_programming #sliding_window