kadane https://leetcode.com/submissions/detail/545186446/

sudoku solver https://leetcode.com/submissions/detail/542160718/

cantor's diagonalization https://leetcode.com/problems/find-unique-binary-string/discuss/1418687/Detailed-Explanation-O(N)-Java-C%2B%2B-Python-short-concise-code-Cantor's-Diagonalization

unexpected binary search 
https://leetcode.com/submissions/detail/539776707/

normalize array https://www.geeksforgeeks.org/count-inversions-array-set-3-using-bit/

mergeSort inversionCount https://www.hackerearth.com/practice/algorithms/sorting/merge-sort/tutorial/

unionFind:
normal and weighted
https://www.hackerearth.com/submission/4517329/