https://leetcode.com/problems/apply-operations-to-an-array/description/


If a[i] == a[i + 1], a[i] *= 2, a[i + 1] = 0 #easy

https://leetcode.com/problems/merge-two-2d-arrays-by-summing-values/description/


Merge two ascending [key, value] lists #easy

https://leetcode.com/problems/partition-array-according-to-given-pivot/description/


Partition around p #medium

Number as sum of distinct powers of 3 #medium #math


https://leetcode.com/problems/check-if-number-is-a-sum-of-powers-of-three/description/

Arithmetic sum #medium #math


https://leetcode.com/problems/count-total-number-of-colored-cells/description/

https://leetcode.com/problems/find-missing-and-repeated-values/description/


Missing and repeated in 1..n array #medium #math

Min diff primes pair in left..right #medium #math


https://leetcode.com/problems/closest-prime-numbers-in-range/

Min 'W' flips to make k 'B' #medium #sliding_window


https://leetcode.com/problems/minimum-recolors-to-get-k-consecutive-black-blocks/description

Count cycling alterating k-subarrays #medium #two_pointers


https://leetcode.com/problems/alternating-groups-ii/description

Substring with all vowels and k others #medium #two_pointers



https://leetcode.com/problems/count-of-substrings-containing-every-vowel-and-k-consonants-ii/description/

Substrings with [abc] #medium #two_pointers



https://leetcode.com/problems/number-of-substrings-containing-all-three-characters/description/

Max positive count or negative count #easy #binary_search


https://leetcode.com/problems/maximum-count-of-positive-integer-and-negative-integer/description/

Min queries (l..r, v) to decrease nums by v to 0 #medium #line_sweep

https://leetcode.com/problems/zero-array-transformation-ii/description/

Distribute candies to k equal buckets #medium #binary_search


https://leetcode.com/problems/maximum-candies-allocated-to-k-children/description/

Min-max of non-adjucents in array #medium #binary_search



https://leetcode.com/problems/house-robber-iv/description/

Min rank[i] * count^2 to fix all cars #medium #binary_search #heap


https://leetcode.com/problems/minimum-time-to-repair-cars/description

All numbers in pairs #easy #counting #sorting


https://leetcode.com/problems/divide-array-into-equal-pairs/description/

Max window of all pairs AND zero #medium #two_pointers #bit_manipulation


https://leetcode.com/problems/longest-nice-subarray/description/

3-bits flips to make all 1 #medium #bit_manipulation


https://leetcode.com/problems/minimum-operations-to-make-binary-array-elements-equal-to-one-i/description/

Min AND of path weights #hard #bit_manipulation #union-find


https://leetcode.com/problems/minimum-cost-walk-in-weighted-graph/description