重新排序数组，使左半部分的总和不等于右半部分的总和

给定一个偶数长度的数组arr[] ，任务是检查是否可以重新排序数组元素，使得左半部分的总和不等于数组右半部分的总和。如果可能，则使用重新排序的序列打印“是” ，否则打印“否” 。
例子：

Input: arr[] = {1, 2, 2, 1, 3, 1} 
Output: 
Yes 
1 1 1 2 2 3 
Explanation: 
sum of left half = 1 + 2 + 2 = 5 
sum of right half = 2 + 2 + 3 = 7 
both the sums are not equal.
Input: arr[] = {1, 1} 
Output: No 
Explanation: 
There is no such arrangement possible. 
 

方法：如果数组的所有元素都相等，那么我们不能重新排序数组元素以满足给定的条件。否则在给定数组的排序序列中，数组左半部分和右半部分的总和将始终不相等。
下面是上述方法的实现：

C

// C program for the above approach
#include 
#include 
 
// A comparator function used by qsort
int compare(const void * a, const void * b)
{
    return (*(int*)a - *(int*)b);
}
 
// Function to print the required
// reordering of array if possible
void printArr(int arr[], int n)
{
     
    // Sort the array in increasing order
    qsort(arr, n, sizeof(int), compare);
 
    // If all elements are equal, then
    // it is not possible
    if (arr[0] == arr[n - 1])
    {
        printf("No\n");
    }
 
    // Else print the sorted array arr[]
    else
    {
        printf("Yes\n");
        for(int i = 0; i < n; i++)
        {
            printf("%d ", arr[i]);
        }
    }
}
 
// Driver Code
int main()
{
     
    // Given array
    int arr[] = { 1, 2, 2, 1, 3, 1 };
 
    int N = sizeof(arr) / sizeof(arr[0]);
 
    // Function call
    printArr(arr, N);
    return 0;
}
 
// This code is contributed by equbalzeeshan

C++

// C++ program for the above approach
#include 
using namespace std;
 
// Function to print the required
// reordering of array if possible
void printArr(int arr[], int n)
{
    // Sort the array in increasing order
    sort(arr, arr + n);
 
    // If all elements are equal, then
    // it is not possible
    if (arr[0] == arr[n - 1]) {
        cout << "No" << endl;
    }
 
    // Else print the sorted array arr[]
    else {
 
        cout << "Yes" << endl;
        for (int i = 0; i < n; i++) {
            cout << arr[i] << " ";
        }
    }
}
 
// Driver Code
int main()
{
    // Given array
    int arr[] = { 1, 2, 2, 1, 3, 1 };
 
    int N = sizeof(arr) / sizeof(arr[0]);
 
    // Function Call
    printArr(arr, N);
    return 0;
}

Java

// Java program for the above approach
import java.util.*;
 
class GFG{
     
// Function to print the required
// reordering of array if possible
public static void printArr(int[] arr, int n)
{
     
    // Sort the array in increasing order
    Arrays.sort(arr);
 
    // If all elements are equal, then
    // it is not possible
    if (arr[0] == arr[n - 1])
    {
        System.out.println("No");
    }
 
    // Else print the sorted array arr[]
    else
    {
        System.out.println("Yes");
        for(int i = 0; i < n; i++)
        {
            System.out.print(arr[i] + " ");
        }
    }
}
 
// Driver code
public static void main(String[] args)
{
     
    // Given array
    int arr[] = { 1, 2, 2, 1, 3, 1 };
 
    int N = arr.length;
 
    // Function call
    printArr(arr, N);
}
}
 
// This code is contributed by equbalzeeshan

Python3

# Python3 program for the above approach
 
# Function to print the required
# reordering of the array if possible
def printArr(arr, n):
 
    # Sort the array in increasing
    # order
    arr.sort()
 
    # If all elements are equal,
    # then it is not possible
    if(arr[0] == arr[n - 1]):
        print("No")
 
    # Else print the sorted
    # array arr[]
    else:
        print("Yes")
        for i in range(n):
            print(arr[i], end = " ")
        print()
 
# Driver Code
if __name__ == '__main__':
 
    # Given array
    arr = [ 1, 2, 2, 1, 3, 1 ]
    N = len(arr)
 
    # Function Call
    printArr(arr, N)
 
# This code is contributed by Shivam Singh

C#

// C# code for the above approach
using System;
 
class GFG{
 
// Function to print the required
// reordering of array if possible
public static void printArr(int[] arr, int n)
{
     
    // Sort the array in increasing order
    Array.Sort(arr);
 
    // If all elements are equal, then
    // it is not possible
    if (arr[0] == arr[n - 1])
    {
        Console.Write("No\n");
    }
 
    // Else print the sorted array arr[]
    else
    {
        Console.Write("Yes\n");
        for(int i = 0; i < n; i++)
        {
            Console.Write(arr[i] + " ");
        }
    }
}
 
// Driver code
public static void Main()
{
     
    // Given array
    int[] arr = new int [6]{ 1, 2, 2, 1, 3, 1 };
 
    int N = arr.Length;
 
    // Function call
    printArr(arr, N);
}
}
 
// This code is contributed by equbalzeeshan

Javascript

 
// Javascript program for the above approach
 
    // Function to print the required
    // reordering of array if possible
    function printArr(arr , n)
    {
 
        // Sort the array in increasing order
        arr.sort();
 
        // If all elements are equal, then
        // it is not possible
        if (arr[0] == arr[n - 1]) {
            document.write("No<br/>");
        }
 
        // Else print the sorted array arr
        else {
            document.write("Yes<br/>");
            for (i = 0; i < n; i++) {
                document.write(arr[i] + " ");
            }
        }
    }
 
    // Driver code
     
 
        // Given array
        var arr = [ 1, 2, 2, 1, 3, 1 ];
 
        var N = arr.length;
 
        // Function call
        printArr(arr, N);
 
// This code contributed by umadevi9616
 

输出：

Yes
1 1 1 2 2 3

时间复杂度： O(N*log(N))

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