https://leetcode.com/problems/count-vowel-strings-in-ranges/description/

Count words[q[0]..q[1]] starting and ending with "aeiou" #medium

https://leetcode.com/problems/number-of-ways-to-split-array/description/


Count splits left_sum >= right_sum #medium #prefix_sum

https://leetcode.com/problems/unique-length-3-palindromic-subsequences/description/


Count palindroms of length 3 #medium

https://leetcode.com/problems/shifting-letters-ii/description/


Apply from..to, direction shifts to string chars #medium #line_sweep

https://leetcode.com/problems/minimum-number-of-operations-to-move-all-balls-to-each-box/description/


Sum distances to all 1 for every position #medium #prefix_sum

https://leetcode.com/problems/string-matching-in-an-array/description/


All substrings #easy

https://leetcode.com/problems/count-prefix-and-suffix-pairs-i/description/


Count prefix-suffix matched pairs #easy

https://leetcode.com/problems/counting-words-with-a-given-prefix/description/


Count words with prefix #easy

https://leetcode.com/problems/word-subsets/description/



Words containing all chars of words2 #medium

https://leetcode.com/problems/construct-k-palindrome-strings/description/

Can make k palindromes from string? #medium

https://leetcode.com/problems/check-if-a-parentheses-string-can-be-valid/description/


Balance parenthesis with wildcards #medium

https://leetcode.com/problems/minimum-length-of-string-after-operations/description/


Length after removing repeatings > 2 #medium

https://leetcode.com/problems/find-the-prefix-common-array-of-two-arrays/description/


A[..i] and B[..i] intersections sizes #medium #counting

https://leetcode.com/problems/minimize-xor/description/

Min xor with num1, bits count of num2 #medium

https://leetcode.com/problems/bitwise-xor-of-all-pairings/description/


Xor of all pairs xors #medium #xor

https://leetcode.com/problems/neighboring-bitwise-xor/description/

Can restore next-sibl-xored array? #medium #xor

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/first-completely-painted-row-or-column/description/


Index of first filled row/column in 2D matrix #medium #counting

https://leetcode.com/problems/grid-game/description/


Maximum of minimized paths #medium #prefix_sum

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

Make growing landscape #medium #bfs