https://leetcode.com/problems/find-eventual-safe-states/description/

Nodes without cycles #medium #dfs #toposort

https://leetcode.com/problems/make-lexicographically-smallest-array-by-swapping-elements/description/


Sort by swapping ab, where abs(a - b) < limit #medium

https://leetcode.com/problems/maximum-employees-to-be-invited-to-a-meeting/description/


Max connected siblings in graph #hard #dfs #toposort

https://leetcode.com/problems/course-schedule-iv/description/

All innodes for each query in graph #medium #dfs #toposort #floyd_warshall

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


Largest region in 2D grid #medium #bfs #dfs

https://leetcode.com/problems/redundant-connection/description/

First edge making a cycle in graph #medium #union_find

https://leetcode.com/problems/divide-nodes-into-the-maximum-number-of-groups/description/


Max count of bipartitions in a graph #hard #bfs #graph

https://leetcode.com/problems/making-a-large-island/description/

Max area after filling one empty 2D grid cell #hard #dfs #union_find

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


All siblings even-odd #easy

https://leetcode.com/problems/check-if-array-is-sorted-and-rotated/description/


Is array sorted and rotated? #easy

https://leetcode.com/problems/longest-strictly-increasing-or-strictly-decreasing-subarray/description/


Longest strict monotonic subarray #easy

https://leetcode.com/problems/maximum-ascending-subarray-sum/description/

Max increasing subarray sum #easy

https://leetcode.com/problems/check-if-one-string-swap-can-make-strings-equal/description/


One swap to make stings equal #easy

https://leetcode.com/problems/tuple-with-same-product/description/


Count uniq 4-tupples a*b=c*d #medium #counting #sort

https://leetcode.com/problems/find-the-number-of-distinct-colors-among-the-balls/description/


Running colors counter #medium #hashmap

https://leetcode.com/problems/design-a-number-container-system/description/


Smallest running index of number in map #medium #treeset

https://leetcode.com/problems/count-number-of-bad-pairs/description/


Count pairs a[i] - a[j] != j - i #medium #counting #sorting

https://leetcode.com/problems/clear-digits/description/


Remove [char][digit] pairs from string #easy

https://leetcode.com/problems/remove-all-occurrences-of-a-substring/description/


Remove substring recursively #medium

https://leetcode.com/problems/max-sum-of-a-pair-with-equal-sum-of-digits/description/


Max pairs sum with equal digits sum #medium