https://leetcode.com/problems/maximum-score-from-removing-substrings/description/

Max score removing from s, x for ab, y for ba #medium #greedy #stack

https://leetcode.com/problems/robot-collisions/description/

1-D dimensional robots fight #hard #stack

https://leetcode.com/problems/number-of-atoms/description/

Simplify chemical formula parenthesis #hard #stack

https://leetcode.com/problems/minimum-string-length-after-removing-substrings/description/


Remove 'AB' and 'CD' from the string #easy #stack

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/minimum-add-to-make-parentheses-valid/description/


Minimum inserts to balance brackets #medium #stack

https://leetcode.com/problems/parsing-a-boolean-expression/description/


Parse boolean expression #hard #stack #recursion

https://leetcode.com/problems/recover-a-tree-from-preorder-traversal/description/


Recover binary tree from depth-dashes string #hard #stack

https://leetcode.com/problems/construct-binary-tree-from-preorder-and-postorder-traversal/description/


Tree from preorder & postorder #medium #stack