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LeetCode KalaHit

1. Backtracking : Idea: check the current position and explore all the next position if this lead to good combination accept the answer otherwise backtrack wait .... what?

             problems: https://leetcode.com/problems/path-with-maximum-gold/
                       https://leetcode.com/problems/permutations/
                       https://leetcode.com/problems/generate-parentheses/
                       https://leetcode.com/problems/subsets/