Given two strings, str1, and str2, write an algorithm to find the minimum number of operations (insert, delete, replace) required to convert str1 into str2.

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Implement Dijkstra's algorithm to find the shortest path in a graph with positive weights, using a priority queue to optimize performance.

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Design an algorithm to serialize a binary tree into a string and then deserialize that string back into the original tree structure.

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Write a solution to place N queens on an N×N chessboard so that no two queens threaten each other.

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Given a n x n matrix where each row and column is sorted in ascending order, find the kth smallest element in the matrix.

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Create an algorithm to find the length of the longest substring without repeating characters in a given string.

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Given a set of jobs with deadlines and profits, if the job is finished before the deadline, maximize total profit if only one job can be scheduled at a time.

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Code an algorithm to find the length of the longest subsequence of a given sequence such that all elements of the subsequence are sorted in increasing order.

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Implement an algorithm to detect if there is a cycle in an undirected graph.

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Write a program to merge k-sorted linked lists & return them as one sorted list. Analyse & implement a more efficient solution than simply connecting all lists and sorting.

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