#include <vector>
#include <algorithm>
#include <iostream>
#include <ranges>
#include <cmath>

struct DistanceComparator {
    int ref;
    constexpr bool operator()(int a, int b) const {
        return std::abs(a - ref) < std::abs(b - ref);
    }
};

int main(){
    std::vector<int> v = {5,1,3,2,4};
    std::ranges::sort(v, DistanceComparator{0}); // sort by distance from 0 (i.e., absolute value)
    for(int x: v) std::cout << x << ' ';
    std::cout << std::endl;
    return 0;
}