https://leetcode.com/problems/separate-black-and-white-balls/description/

Min moves to sort 01 string #medium #greedy

https://leetcode.com/problems/longest-happy-string/description/


Longest string of a, b, c not repeating 3 times #medium #greedy

https://leetcode.com/problems/maximum-swap/description/

Max number after a single digits swap #medium #greedy

https://leetcode.com/problems/count-number-of-maximum-bitwise-or-subsets/description/


Count subsequences with max bitwise or #medium #backtracking

https://leetcode.com/problems/find-kth-bit-in-nth-binary-string/description/


k`th bit of sequence `bs[i] = bs[i-1] + '1' + rev(inv(bs[i-1])) #medium #bit_manipulation

https://leetcode.com/problems/parsing-a-boolean-expression/description/


Parse boolean expression #hard #stack #recursion

https://leetcode.com/problems/split-a-string-into-the-max-number-of-unique-substrings/description/


Max count of unique split parts #medium #backtrack

https://leetcode.com/problems/kth-largest-sum-in-a-binary-tree/description/

`k`th largest level-sum in a tree #bfs #heap #quickselect

https://leetcode.com/problems/cousins-in-binary-tree-ii/description/


Replace Tree's values with cousines sum #medium #bfs

https://leetcode.com/problems/flip-equivalent-binary-trees/description/


Are trees flip-equal #medium #recursion #dfs

https://leetcode.com/problems/remove-sub-folders-from-the-filesystem/description/


Remove empty subfolders #medium #trie #sort

https://leetcode.com/problems/height-of-binary-tree-after-subtree-removal-queries/description/

n new heights by cutting nodes in a Tree #hard #dfs

somebody will receive this today

https://leetcode.com/problems/count-square-submatrices-with-all-ones/description/


Count 1-filled squares in 2D matrix #medium #dynamic_programming

https://leetcode.com/problems/longest-square-streak-in-an-array/description/


Longest quadratic subset #medium #hashmap #math

https://leetcode.com/problems/maximum-number-of-moves-in-a-grid/description/


Max increasing path from left to right in 2D matrix #medium #dynamic_programming

https://leetcode.com/problems/minimum-number-of-removals-to-make-mountain-array/description/


Min removes to make a mountain #hard #dynamic_programming #binary_search #lis

https://leetcode.com/problems/minimum-total-distance-traveled/description/


Min robots[x] travel to factories[x,capacity] #hard #dynamic_programming #sorting

https://leetcode.com/problems/delete-characters-to-make-fancy-string/description/


Filter 3+ repeating chars from string #easy

https://leetcode.com/problems/circular-sentence/description/


Are words circular? #easy

https://leetcode.com/problems/rotate-string/description/


Is string rotated goal? #easy #kmp #rolling-hash