https://leetcode.com/problems/maximize-happiness-of-selected-children/description/

Sum of k maximums decreasing each step #medium #sorting #heap #quickselect

https://leetcode.com/problems/k-th-smallest-prime-fraction/description/

k`th `arr[i]/arr[j], i < j, arr[i] < arr[j] #medium #heap #binary_search

https://leetcode.com/problems/minimum-cost-to-hire-k-workers/description/

Min cost of k workers each doing quality[i] work for fair rate #hard #heap #sorting

https://leetcode.com/problems/find-the-safest-path-in-a-grid/description/

Safest path in a grid with thiefs #medium #bfs #heap

https://leetcode.com/problems/hand-of-straights/description/

Can array be split into consecutive groups #medium #heap #treemap

https://leetcode.com/problems/ipo/description/

Max capital by choosing k jobs with profits[] & capital[] given w on start #hard #heap

https://leetcode.com/problems/range-sum-of-sorted-subarray-sums/description/

Sum of [left..right] of sorted subarray sums #medium #heap

https://leetcode.com/problems/kth-largest-element-in-a-stream/description/

`k`th largest in a stream of values #easy #heap

https://leetcode.com/problems/ugly-number-ii/description/

`n`th number with only [1,2,3,5] multipliers #medium #heap

https://leetcode.com/problems/the-number-of-the-smallest-unoccupied-chair/description/


target's chair number when chairs reused by multiple [arrival, leave] times #medium #sorting #heap

https://leetcode.com/problems/divide-intervals-into-minimum-number-of-groups/description/


Count non-intersecting groups of intervals #medium #heap #sorting

https://leetcode.com/problems/smallest-range-covering-elements-from-k-lists/description/


Smallest intersection of k sorted lists #medium #heap #tree_set

https://leetcode.com/problems/maximal-score-after-applying-k-operations/description/


Replace max(arr) with ceil(max/3) k times #medium #heap

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/minimized-maximum-of-products-distributed-to-any-store/description/


Min of max of quantities spread by n single-type stores #medium #binary_search #heap

https://leetcode.com/problems/shortest-subarray-with-sum-at-least-k/description/


Min subarray with sum at least k #hard #monotonic_queue #heap