<ul><li>A HashMap is a data structure that provides optimal performance for searching elements in large arrays.</li><li>Using hashing, a HashMap assigns an index to each element based on its hash value, allowing for fast retrieval.</li><li>In case of collisions, where multiple elements have the same hash value, a linked list is used to store the elements at the same index.</li><li>The HashMap implementation includes functions for adding, deleting, checking for element existence, counting, and printing the elements.</li></ul>

Implementing a HashMap in Rust

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