# 程序以 Z 格式打印矩陣 > 原文： [https://www.geeksforgeeks.org/program-print-matrix-z-form/](https://www.geeksforgeeks.org/program-print-matrix-z-form/) 給定 n * n 階方陣，我們需要以 Z 形式打印矩陣的元素 ``` 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 ```  復雜度`O(n)` 我們需要遍歷矩陣的第一行，然后遍歷第二對角線，然后遍歷最后一行。 ## 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\. ?> ``` **輸出**： ``` 4 5 6 8 3 8 1 8 7 5 ``` **替代的簡單實現**： 感謝 [Aathishithan](https://auth.geeksforgeeks.org/user/Aathishithan) 提出了這一建議。 ``` // 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);? ????}? }? ``` **輸出**： ``` 4 5 6 8 2 9 1 8 7 5 ```