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