Now implement it on LeetCode yourself. A few things to watch for: The problem guarantees exactly one solution. You don't need to handle "no solution." Don't add the current element to the map before checking for the complement. Otherwise you might match an element with itself. Return indices, not values. This is the most common hash map pattern. Learn it well.
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$ curl repovive.com/roadmaps/maang-interview-prep/arrays-hashing/two-sum-implementation
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