https://leetcode.com/problems/k-th-smallest-in-lexicographical-order/description/

k lexicographically smallest value from 1..n #hard #math

https://leetcode.com/problems/divide-players-into-teams-of-equal-skill/description/


Sum of products of pairs with equal sums #medium #math

https://leetcode.com/problems/longest-square-streak-in-an-array/description/


Longest quadratic subset #medium #hashmap #math

https://leetcode.com/problems/product-of-the-last-k-numbers/description/

Running suffix product #medium #math #prefix_product

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 sum of differences of x times #medium #math #quickselect



https://leetcode.com/problems/minimum-operations-to-make-a-uni-value-grid/description/

Sum of all subsets xors #easy #bit #math


https://leetcode.com/problems/sum-of-all-subset-xor-totals/description

https://leetcode.com/problems/count-the-number-of-powerful-integers/description/


Numbers in range start..finish, digits up to limit #hard #dp #math

Count palindromes of length n, divisible by k #hard #math #permutations


https://leetcode.com/problems/find-the-count-of-good-integers/description/

https://leetcode.com/problems/count-good-numbers/description/


Count (0,2,4,6,8)(2,3,5,7) generated strings of length n #medium #math

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

Subarrays with at least k equal pairs #medium #sliding_window #math

https://leetcode.com/problems/rabbits-in-forest/description


Count total rabbits from other numbers #medium #math #brainteaser

Permutations of even-odd position sums equal #hard #dp #math


https://leetcode.com/problems/count-number-of-balanced-permutations/description/

t steps to convert char into next nums[c] chars #hard #dp #math


https://leetcode.com/problems/total-characters-in-string-after-transformations-ii/description

https://leetcode.com/problems/divisible-and-non-divisible-sums-difference/description/


Sum non-divisible minus sum divisible #easy #math

https://leetcode.com/problems/distribute-candies-among-children-ii/description/


Ways to give limited from n candies to 3 kids #medium #math #combinations

# 17.06.2025
[3405. Count the Number of Arrays with K Matching Adjacent Elements](https://leetcode.com/problems/count-the-number-of-arrays-with-k-matching-adjacent-elements/description/) hard


Combinations k equal siblings 1..m in [n] array #hard #combinatorics #math