C++数组值排序

#include<iostream>
#include<algorithm>

int main() {
    int arr[] = {5, 3, 8, 1, 9};
    int n = sizeof(arr) / sizeof(arr[0]);

    std::sort(arr, arr + n);

    for (int i = 0; i < n; i++) {
        std::cout<< arr[i] << " ";
    }

    return 0;
}

std::sort(arr, arr + n, std::greater<int>());

#include<iostream>
#include<algorithm>
#include <cmath>

bool abs_compare(int a, int b) {
    return std::abs(a) < std::abs(b);
}

int main() {
    int arr[] = {-3, 2, -5, 1, 4};
    int n = sizeof(arr) / sizeof(arr[0]);

    std::sort(arr, arr + n, abs_compare);

    for (int i = 0; i < n; i++) {
        std::cout<< arr[i] << " ";
    }

    return 0;
}