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Create a hashmap so that D[x] = i whenever B[i] = x. Then, the answer is [D[x] for x in A].
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Yes, problems like Find Anagram Mappings are common in coding interviews because they test understanding of arrays and hash maps. They also evaluate whether candidates can optimize lookups using appropriate data structures.
If duplicates exist, the hash map can store a list or stack of indices for each value in the second array. When processing the first array, you remove or use one index from the list to ensure each occurrence is mapped correctly.
A hash table (or hash map) is the most suitable data structure because it allows constant-time lookups. It stores the mapping from array values to their indices, enabling efficient reconstruction of the anagram mapping.
The optimal approach uses a hash map to store values from the second array along with their indices. By looking up each element from the first array in the map, you can quickly determine the corresponding index. This results in O(n) time complexity.