https://leetcode.com/problems/find-the-city-with-the-smallest-number-of-neighbors-at-a-threshold-distance/description/

Node with minimum neighbours by distanceThreshold #medium #bfs #FloydWarshall

https://leetcode.com/problems/second-minimum-time-to-reach-destination/description/

Second min time to travel from 1 to n in time-edged graph stopping every change seconds #hard #graph #bfs

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/sliding-puzzle/description/


Steps to solve slide puzzle #hard #bfs

https://leetcode.com/problems/shortest-distance-after-road-addition-queries-i/description/


Query shortest paths after adding new edges #medium #bfs

https://leetcode.com/problems/minimum-obstacle-removal-to-reach-corner/description/


Min removals to travel first-last in 2D grid #hard #bfs #dijkstra

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/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/minimum-cost-to-make-at-least-one-valid-path-in-a-grid/description/


Min undirected jumps to reach the end in grid #hard #bfs

https://leetcode.com/problems/trapping-rain-water-ii/description/


Trap the water in 2D height matrix #hard #bfs

https://leetcode.com/problems/map-of-highest-peak/description/

Make growing landscape #medium #bfs

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


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

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/find-elements-in-a-contaminated-binary-tree/description/


Is number in a tree 2*v+(1L, 2R)? #medium #bfs #dfs

Running queries of increasing BFS #hard #bfs #heap


https://leetcode.com/problems/maximum-number-of-points-from-grid-queries/description/

https://leetcode.com/problems/find-minimum-time-to-reach-last-room-i/description


Fastest path in graph #medium #bfs

https://leetcode.com/problems/find-minimum-time-to-reach-last-room-ii/description/


Fastest travel in graph, alternating dt=1,2 #medium #bfs

https://leetcode.com/problems/find-closest-node-to-given-two-nodes/description


Closest common node #medium #bfs

https://leetcode.com/problems/snakes-and-ladders/description/


Shortest path bottom-top in zig-zag matrix with jumps #medium #bfs