Multiple ChoiceIntermediate 45s
map insert hint with end()
Why is `m.insert(m.end(), value)` a common idiom for `std::map`?
Options
- 1Inserting at end() guarantees the key is placed last in iteration order, regardless of its actual key value.
- 2It has no effect on complexity, because insertion hints are ignored by std::map as a documented no-op.
- 3It converts the insert into an emplace, avoiding a copy of the value_argument even when no hint is given.
- 4end() as a hint indicates the value is likely greater than all keys, so the insert can often be O(1) at the rightmost node.
Think you can answer under pressure?
Get matched and answer live questions in 3-minute 1v1 battles. Elo ranking, badge tiers and bragging rights on the line.