交换矩阵对角线的Javascript程序

给定一个 n*n 阶的方阵，你必须交换两条对角线的元素。
例子 ：

Input : matrix[][] = {1, 2, 3,
                      4, 5, 6,
                      7, 8, 9} 
Output : matrix[][] = {3, 2, 1,
                       4, 5, 6,
                       9, 8, 7} 

Input : matrix[][] = {4,  2,  3,  1,
                      5,  7,  6,  8,
                      9, 11, 10, 12,
                     16, 14, 15, 13} 
Output : matrix[][] = {1,  2,  3,  4,
                       5,  6,  7,  8,
                       9, 10, 11, 12,
                      11, 14, 15, 16}

解释：交换方阵的对角线背后的想法很简单。从 0 迭代到 n-1，每次迭代都必须交换 a[i][i] 和 a[i][ni-1]。

时间复杂度：O(n)

Javascript

// Javascript program to interchange 
// the diagonals of matrix
let N = 3;
  
// Function to interchange diagonals
function interchangeDiagonals(array)
{
  
    // swap elements of diagonal
    for (let i = 0; i < N; ++i)
    if (i != parseInt(N / 2)) {
        let temp = array[i][i];
        array[i][i] = array[i][N - i - 1];
        array[i][N - i - 1] = temp;
    }
    for (let i = 0; i < N; ++i)
    {
    for (let j = 0; j < N; ++j)
            document.write(" " + array[i][j]);
    document.write("<br>");
    }
}
  
// Driver Code
    let array = [[4, 5, 6],
                    [1, 2, 3],
                    [7, 8, 9]];
    interchangeDiagonals(array);
  
// This code is contributed by subham348.

输出：

6 5 4
 1 2 3
 9 8 7

请参阅完整的文章关于交换矩阵对角线的程序以获取更多详细信息！