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edited Nov 4, 2020 at 17:09

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Know your containers

std::unordered_mapstd::unordered_map is your friend in this problem. Whenever you've never previously seen a number, simply use the operator[] or insert function to add the number and it'sits index. When using findfind, it will return an iterator, which is a key-value pair.

eg: auto location = m.find(numToFind);

location->first is your key, and location->second is your value

When you return, don't use push_back

You can simply return an initializer list like: {i,j}.

Know your containers

std::unordered_map is your friend in this problem. Whenever you've never previously seen a number, simply use the operator[] or insert function to add the number and it's index. When using find, it will return an iterator, which is a key-value pair.

eg: auto location = m.find(numToFind);

location->first is your key location->second is your value

When you return, don't use push_back

You can simply return an initializer list like: {i,j}

Know your containers

std::unordered_map is your friend in this problem. Whenever you've never previously seen a number, simply use the operator[] or insert function to add the number and its index. When using find, it will return an iterator, which is a key-value pair.

eg: auto location = m.find(numToFind);

location->first is your key, and location->second is your value

When you return, don't use push_back

You can simply return an initializer list like: {i,j}.

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created Nov 4, 2020 at 11:27

Alex Shirley

Know your containers

eg: auto location = m.find(numToFind);

location->first is your key location->second is your value

When you return, don't use push_back

You can simply return an initializer list like: {i,j}