Lexicographical Numbers | Leetcode 386

This problem explains generating lexicographically ordered numbers from 1 to N using most optimal recursion approach.
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𝐁𝐚𝐬𝐢𝐜𝐬 𝐨𝐟 𝐓𝐑𝐈𝐄:    • Basics of trie  
𝐓𝐑𝐈𝐄 𝐢𝐧𝐬𝐞𝐫𝐭𝐢𝐨𝐧 𝐚𝐧𝐝 𝐬𝐞𝐚𝐫𝐜𝐡:    • Trie insertion and search  
𝐓𝐑𝐈𝐄 𝐝𝐞𝐥𝐞𝐭𝐢𝐨𝐧 𝐚𝐧𝐝 𝐬𝐞𝐚𝐫𝐜𝐡:    • Trie deletion and search  
𝐂𝐨𝐮𝐧𝐭 𝐧𝐮𝐦𝐛𝐞𝐫 𝐨𝐟 𝐬𝐭𝐫𝐢𝐧𝐠𝐬 𝐰𝐢𝐭𝐡 𝐠𝐢𝐯𝐞𝐧 𝐩𝐫𝐞𝐟𝐢𝐱:    • Count number of strings with given pr...  
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