2201-valid-arrangement-of-pairs 2213-find-all-people-with-secret 2217-step-by-step-directions-from-a-binary-tree-node-to-another2231-find-first-palindromic-string-in-the-array 2232-adding-spaces-to-a-string 2255-minimum-swaps-to-group-all-1s-together-ii ...
return not stack Explain the Solution to a Non-programmer: We’re trying to check if a series of open and closed brackets are arranged correctly. We treat the brackets like a line at a theme park. An open bracket gets in line, and when a close bracket comes, it can only get on th...