https://leetcode.com/problems/replace-words/description/

Replace words with suffixes from dictionary #medium #trie

https://leetcode.com/problems/continuous-subarray-sum/description/

Any subarray sum % k = 0 #medium #hashmap

https://leetcode.com/problems/subarray-sums-divisible-by-k/description/

Count subarrays divisible by k #medium #hashmap

https://leetcode.com/problems/height-checker/description/

Count unsorted elements in array #easy

https://leetcode.com/problems/relative-sort-array/description/

Sort an array by the given order #easy

https://leetcode.com/problems/sort-colors/description/

Sort 012 array #medium

https://leetcode.com/problems/minimum-number-of-moves-to-seat-everyone/description/

Sum of diffs of sorted students and seats #easy

https://leetcode.com/problems/minimum-increment-to-make-array-unique/description/

Min increments to make items unique #medium

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/patching-array/description/

Insertions to make subsets sums fill 1..n #hard

https://leetcode.com/problems/sum-of-square-numbers/description/

Is c sum of squares? #medium #binary_search

https://leetcode.com/problems/most-profit-assigning-work/description/

Max profit by assigning [profit, difficulty] to workers any times #medium #sorting #greedy

https://leetcode.com/problems/minimum-number-of-days-to-make-m-bouquets/description/

Min days to take m k-subarrays #medium #binary_search

https://leetcode.com/problems/magnetic-force-between-two-balls/description/

Max shortest distance between m positions #medium #binary_search

https://leetcode.com/problems/grumpy-bookstore-owner/description/

Max customers sum after make consecutive minutes non-grumpy #medium #sliding_window

https://leetcode.com/problems/count-number-of-nice-subarrays/description/

Count subarrays with k odds #medium #sliding_window

https://leetcode.com/problems/longest-continuous-subarray-with-absolute-diff-less-than-or-equal-to-limit/description/

Longest subarray with abs(a[i] - a[j]) <= limit #medium #sliding_window #monotonic_queue

https://leetcode.com/problems/minimum-number-of-k-consecutive-bit-flips/description/

Count k-range flips in binary array to make all 1 #hard #sliding_window

https://leetcode.com/problems/binary-search-tree-to-greater-sum-tree/description/

Aggregate Binary Search Tree from the right #medium #tree

https://leetcode.com/problems/balance-a-binary-search-tree/description/

Make a balanced Binary Search Tree #medium

https://leetcode.com/problems/find-center-of-star-graph/description/

Center of a start graph #easy