# 程序以 Z 格式打印矩阵 > 原文： [https://www.geeksforgeeks.org/program-print-matrix-z-form/](https://www.geeksforgeeks.org/program-print-matrix-z-form/) 给定 n * n 阶方阵，我们需要以 Z 形式打印矩阵的元素 ``` Examples: Input : mat[][] = {1, 2, 3, 4, 5, 6, 7, 8, 9} Output : 1 2 3 5 7 8 9 Input : mat[][] = {5, 19, 8, 7, 4, 1, 14, 8, 2, 20, 1, 9, 1, 2, 55, 4} Output: 5 19 8 7 14 20 1 2 55 4 ```  复杂度`O(n)` 我们需要遍历矩阵的第一行，然后遍历第二对角线，然后遍历最后一行。 ## CPP ``` // CPP program to print a square matrix in Z form #include <bits/stdc++.h> using namespace std; const int MAX = 100; // Function to print a square matrix in Z form void printZform(int mat[][MAX], int n) {     // print first row     for (int i = 0; i < n; i++)         cout << mat[0][i] << " ";     // Print diagonal     int i = 1, j = n - 2;     while (i < n && j >= 0) // print diagonal     {         cout << mat[i][j] << " ";         i++;         j--;     }     // Print last row     for (int i = 1; i < n; i++)         cout << mat[n - 1][i] << " "; } // Driver function int main() {     int mat[][MAX] = { { 4, 5, 6, 8 },                        { 1, 2, 3, 1 },                        { 7, 8, 9, 4 },                        { 1, 8, 7, 5 } };     printZform(mat, 4);     return 0; } ``` ## Java ```java // Java program to print a // square matrix in Z form import java.lang.*; import java.io.*; class GFG {     public static void diag(int arr[][], int n)     {         int i = 0, j, k;         // print first row         for (j = 0; j < n - 1; j++) {             System.out.print(arr[i][j] + " ");         }         // Print diagonal         k = 1;         for (i = 0; i < n - 1; i++) {             for (j = 0; j < n; j++) {                 if (j == n - k) {                     System.out.print(arr[i][j] + " ");                     break;                 }             }             k++;         }         // Print last row         i = n - 1;         for (j = 0; j < n; j++)             System.out.print(arr[i][j] + " ");         System.out.print("\n");     }     public static void main(String[] args)     {         int a[][] = { { 4, 5, 6, 8 },                       { 1, 2, 3, 1 },                       { 7, 8, 9, 4 },                       { 1, 8, 7, 5 } };         diag(a, 4);     } } // Code contributed by Mohit Gupta_OMG <(0_o)> ``` ## Python3 ```py # Python program to print a  # square matrix in Z form arr = [[4, 5, 6, 8],          [1, 2, 3, 1],          [7, 8, 9, 4],          [1, 8, 7, 5]] n = len(arr[0]) i = 0 for j in range(0, n-1):     print(arr[i][j], end = ' ')  k = 1 for i in range(0, n):     for j in range(n, 0, -1):         if(j == n-k):             print(arr[i][j], end = ' ')              break;      k+= 1 # Print last row i = n-1;  for j in range(0, n):     print(arr[i][j], end = ' ') # Code contributed by Mohit Gupta_OMG <(0_o)> ``` ## C# ```cs // C# program to print a square  // matrix in Z form using System; class GFG {     public static void printZform(int[, ] mat, int n)     {         int i, j;         // print first row         for (i = 0; i < n; i++) {             Console.Write(mat[0, i] + " ");         }         // Print diagonal         i = 1;         j = n - 2;         while (i < n && j >= 0) // print diagonal         {             Console.Write(mat[i,j] + " ");             i++;             j--;         }         // Print last row         for (i = 1; i < n; i++)             Console.Write(mat[n - 1,i] + " ");     }     // Driver code     public static void Main()     {         int[, ] mat = { { 4, 5, 6, 8 },                     { 1, 2, 3, 1 },                     { 7, 8, 9, 4 },                     { 1, 8, 7, 5 } };         printZform(mat, 4);     } } // This code is contributed by vt_m. ``` ## PHP ```php <?php // PHP program to print a  // square matrix in Z form $MAX = 100; // Function to print a  // square matrix in Z form function printZform( $mat, $n) {     // print first row     for($i = 0; $i < $n; $i++)         echo $mat[0][$i] , " ";     // Print diagonal     $i = 1;$j = $n - 2;     // print diagonal     while ($i < $n and $j >= 0)      {         echo $mat[$i][$j] , " ";         $i++;         $j--;     }     // Print last row     for ( $i = 1; $i < $n; $i++)         echo $mat[$n - 1][$i] , " "; }     // Driver Code     $mat = array(array(4, 5, 6, 8),                  array(1, 2, 3, 1),                  array(7, 8, 9, 4),                  array(1, 8, 7, 5));     printZform($mat, 4); // This code is contributed by anuj_67\. ?> ``` **输出**： ``` 4 5 6 8 3 8 1 8 7 5 ``` **替代的简单实现**： 感谢 [Aathishithan](https://auth.geeksforgeeks.org/user/Aathishithan) 提出了这一建议。 ``` // Java program to print a  // square matrix in Z form  import java.lang.*;  import java.io.*;  class GFG {      public static void diag(int arr[][], int n)      {          int i = 0, j, k;          for(i = 0;i < n;i++){            for(j = 0;j < n;j++){               if(i == 0){                 System.out.print(arr[i][j]+" ");               } else if(i == j){                    System.out.print(arr[i][j]+" ");               } else if(i == n-1){                    System.out.print(arr[i][j]+" ");               }            }         }     }      public static void main(String[] args)      {          int a[][] = { { 4, 5, 6, 8 },                      { 1, 2, 3, 1 },                      { 7, 8, 9, 4 },                      { 1, 8, 7, 5 } };          diag(a, 4);      }  }  ``` **输出**： ``` 4 5 6 8 2 9 1 8 7 5 ```