Reflections on Learning C++: Depth-First Search and Algorithm Fundamentals

Recently, the child struggled with understanding depth-first search in C++, and since they did not pass the GESP Level 4 exam in September, after discussing with the teacher, we attended a class together on November 16, 2025. It was quite rewarding. We explored the concepts of depth-first search and breadth-first search, particularly the offset of a grid cell. We practiced using a for loop on a Go board to illustrate how the offsets (up, down, left, right) operate within the program. This is crucial as it relates to two-dimensional arrays, maps, depth-first search, and breadth-first search; without understanding these, it is impossible to solve problems. By understanding the principles of computer operation, the child learned that a computer produces results after computation, which requires both original data (input data) and algorithmic data (which can be understood as instructions or logical operations). Furthermore, data must have a place to reside, which involves understanding the storage locations and the order of reading and deleting data, thus grasping the concepts of one-dimensional and two-dimensional arrays, containers, stacks, and queues. The program involves two important concepts: memory space and execution time. Algorithms that do not consider memory and time are referred to as brute-force algorithms. The child has a good memory and has memorized a set of programs for each typical algorithm.

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