Leetcode todo

Medium:
1) https://leetcode.com/problems/bulb-switcher/
2)https://leetcode.com/problems/smallest-number-in-infinite-set/
3) https://leetcode.com/problems/maximum-width-of-binary-tree/
4) https://leetcode.com/problems/longest-zigzag-path-in-a-binary-tree/
5) https://leetcode.com/problems/number-of-subsequences-that-satisfy-the-given-sum-condition/

Hard:
1) https://leetcode.com/problems/remove-max-number-of-edges-to-keep-graph-fully-traversable/
2) https://leetcode.com/problems/checking-existence-of-edge-length-limited-paths/
3) https://leetcode.com/problems/checking-existence-of-edge-length-limited-paths/description/
4) https://leetcode.com/problems/restore-the-array/
5) https://leetcode.com/problems/minimum-insertion-steps-to-make-a-string-palindrome/
6) https://leetcode.com/problems/profitable-schemes/
7) https://leetcode.com/problems/number-of-ways-to-form-a-target-string-given-a-dictionary/
8) https://leetcode.com/problems/maximum-value-of-k-coins-from-piles/
9) https://leetcode.com/problems/find-the-longest-valid-obstacle-course-at-each-position/

review month of may