sort(arr, arr + n, greater<T>()); 

// C++程序将Vector按降序排序
//使用C++ STL中的sort()
 
#include <bits/stdc++.h>;
using namespace std;
 
int main()
{
    // 获取Vector
    vector<int> a = { 1, 45, 54, 71, 76, 12 };
 
    // 打印Vector
    cout << "Vector：";
    for (int i = 0; i < a.size(); i++)
        cout << a[i] << " ";
    cout << endl;
 
    // 将Vector按降序排序
    sort(a.begin(), a.end(), greater<int>());
 
    // 打印逆序Vector
    cout << "降序排列的Vector：\n";
    for (int i = 0; i < a.size(); i++)
        cout << a[i] << " ";
    cout << endl;
 
    return 0;
}  

Vector：1 45 54 71 76 12 
降序排列的Vector：
76 71 54 45 12 1 

sort(arr.rbegin(),arr.rend()); 

// C++程序将Vector按降序排序
//使用C++ STL中的sort()
 
#include <bits/stdc++.h>;
using namespace std;
 
int main()
{
    // 获取Vector
    vector<int> a = { 1, 7, 5, 4, 6, 12 };
 
    // 打印Vector
    cout << "Vector：";
    for (int i = 0; i < a.size(); i++)
        cout << a[i] << " ";
    cout << endl;
 
    // 将Vector按降序排序
    sort(a.rbegin(), a.rend());
 
    // 打印逆序Vector
    cout << "降序排列的Vector：\n";
    for (int i = 0; i < a.size(); i++)
        cout << a[i] << " ";
    cout << endl;
 
    return 0;
}  

Vector: 1 7 5 4 6 12 
降序排列的Vector：
12 7 6 5 4 1