[100 problems](https://leetcode.com/discuss/study-guide/1688903/Solved-all-two-pointers-problems-in-100-days.)

лекция 5. префиксная сумма и пойнтеры

RUNNING FROM BOTH ENDS

125. Valid Palindrome https://leetcode.com/problems/valid-palindrome/

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15. 3Sum https://leetcode.com/problems/3sum/

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75. Sort Colors https://leetcode.com/problems/sort-colors/description/

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344. Reverse string https://leetcode.com/problems/reverse-string/description/

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345. Reverse vowels in a string https://leetcode.com/problems/reverse-vowels-of-a-string/submissions/483108738/

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680. Valid palindrome 2 with deleting https://leetcode.com/problems/valid-palindrome-ii/description/