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To find two indices in an array whose values sum to a given target in less than O(n²) time, we can use a hash map for an efficient O(n) solution.
Steps to Implement
1. Initialize a Hash Map
Create an empty dictionary to store numbers and their indices as you iterate.
2. Iterate Through the Array
For each element num at index i, calculate its complement:
complement = target - numGekopieerd.āKopiëren3. Check for Complement in Hash Map
If the complement exists in the hash map, return the stored index and the current index.
If not, store the current number with its index in the hash map.
4. Return Result
Since the problem guarantees exactly one solution, you can return as soon as you find the pair.
Python Implementation
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