https://leetcode.com/problems/boats-to-save-people/description/

Minimum total boats with at most 2 people & limit weight #medium #two_pointers #greedy

https://leetcode.com/problems/find-k-th-smallest-pair-distance/description/

`k`th smallest pairs diff in array #hard #binary_search #two_pointers

https://leetcode.com/problems/longest-subarray-with-maximum-bitwise-and/description/

Max bitwise AND subarray #medium #bit_manipulation #two_pointers

https://leetcode.com/problems/find-the-longest-substring-containing-vowels-in-even-counts/description/

Longest substring with even number of "aeiou" #medium #bit_manipulation #two_pointers

https://leetcode.com/problems/permutation-in-string/description/


Is s2 contains permutation of s1? #medium #two_pointers

https://leetcode.com/problems/minimum-number-of-swaps-to-make-the-string-balanced/description/


Min swaps to balance brackets #medium #two_pointers #stack

https://leetcode.com/problems/string-compression-iii/description/



Compress repeating chars in string #medium #two_pointers

https://leetcode.com/problems/count-the-number-of-fair-pairs/description/



Count pairs a[i] + a[j] in lower..upper #medium #binary_search #two_pointers

https://leetcode.com/problems/shortest-subarray-to-be-removed-to-make-array-sorted/description/

Min subarray remove to make array sorted #medium #two_pointers

https://leetcode.com/problems/take-k-of-each-character-from-left-and-right/description/


Min take k of a,b,c from head or tail #medium #two_pointers

https://leetcode.com/problems/special-array-ii/description/

Queries is all adjucents parity differ [i..j] #medium #two_pointers