What is the difference between std::unique and std::remove?

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Accepted Answer

**unique** — removes consecutive duplicates. **remove** — removes by value. **std::unique:** - Removes consecutive duplicates. - Doesn't actually erase (returns new end). ```cpp std::vector v = {1, 1, 2, 2, 2, 3}; auto new_end = std::unique(v.begin(), v.end()); v.erase(new_end, v.end()); // v: 1, 2, 3 ``` **std::remove:** - Removes by value. - Doesn't actually erase. ```cpp std::vector v = {1, 2, 3, 2, 4}; auto new_end = std::remove(v.begin(), v.end(), 2); v.erase(new_end, v.end()); // v: 1, 3, 4 ``` **Erase-remove idiom:** ```cpp v.erase(std::remove(v.begin(), v.end(), value), v.end()); ```

C++: What is the difference between std::unique and std::remove?