Sort std::vector but ignore a certain number

Question

I have an std::vector of the size 10 and each entry is initially -1. This vector represents a leaderboard for my game (high scores), and -1 just means th

Answer 1

Combine partitioning and sorting:

std::sort(v.begin(),
          std::partition(v.begin(), v.end(), [](int n){ return n != -1; }));

If you store the iterator returned from partition, you already have a complete description of the range of non-trivial values, so you don't need to look for −1s later.