# 以蛇形图案打印矩阵 > 原文： [https://www.geeksforgeeks.org/print-matrix-snake-pattern/](https://www.geeksforgeeks.org/print-matrix-snake-pattern/) 给定一个 n x n 矩阵。在给定的矩阵中，您必须以蛇形图案打印矩阵的元素。 **示例**： ``` Input :mat[][] = { {10, 20, 30, 40}, {15, 25, 35, 45}, {27, 29, 37, 48}, {32, 33, 39, 50}}; Output : 10 20 30 40 45 35 25 15 27 29 37 48 50 39 33 32 Input :mat[][] = { {1, 2, 3}, {4, 5, 6}, {7, 8, 9}}; Output : 1 2 3 6 5 4 7 8 9 ```  我们遍历所有行。 对于每一行，我们检查它是偶数还是奇数。 如果是偶数，我们从左到右打印，否则从右到左打印。 ## C++ ```cpp // C++ program to print matrix in snake order #include <iostream> #define M 4 #define N 4 using namespace std; void print(int mat[M][N]) {     // Traverse through all rows     for (int i = 0; i < M; i++) {         // If current row is even, print from         // left to right         if (i % 2 == 0) {             for (int j = 0; j < N; j++)                 cout << mat[i][j] << " ";         // If current row is odd, print from         // right to left         } else {             for (int j = N - 1; j >= 0; j--)                 cout << mat[i][j] << " ";         }     } } // Driver code int main() {     int mat[][] = { { 10, 20, 30, 40 },                     { 15, 25, 35, 45 },                     { 27, 29, 37, 48 },                     { 32, 33, 39, 50 } };     print(mat);     return 0; } ``` ## Java ```java // Java program to print matrix in snake order import java.util.*; class GFG {     static void print(int [][] mat)     {         // Traverse through all rows         for (int i = 0; i < mat.length; i++)         {             // If current row is even, print from             // left to right             if (i % 2 == 0)             {                 for (int j = 0; j < mat[0].length; j++)                     System.out.print(mat[i][j] +" ");             // If current row is odd, print from             // right to left             }             else             {                 for (int j = mat[0].length - 1; j >= 0; j--)                     System.out.print(mat[i][j] +" ");             }         }     }     // Driver code     public static void main(String[] args)     {         int mat[][] = new int[][]         {             { 10, 20, 30, 40 },             { 15, 25, 35, 45 },             { 27, 29, 37, 48 },             { 32, 33, 39, 50 }         };         print(mat);     } } /* This code is contributed by Mr. Somesh Awasthi */ ``` ## Python 3 ``` # Python 3 program to print # matrix in snake order M = 4 N = 4 def printf(mat):     global M, N     # Traverse through all rows     for i in range(M):         # If current row is         # even, print from         # left to right         if i % 2 == 0:             for j in range(N):                 print(str(mat[i][j]),                           end = " ")         # If current row is          # odd, print from         # right to left         else:             for j in range(N - 1, -1, -1):                 print(str(mat[i][j]),                            end = " ") # Driver code mat = [[ 10, 20, 30, 40 ],        [ 15, 25, 35, 45 ],        [ 27, 29, 37, 48 ],        [ 32, 33, 39, 50 ]] printf(mat) # This code is contributed # by ChitraNayal ``` ## C# ```cs // C# program to print  // matrix in snake order using System; class GFG {     static void print(int [,]mat)     {         // Traverse through all rows         for (int i = 0;                   i < mat.GetLength(0); i++)         {             // If current row is              // even, print from              // left to right             if (i % 2 == 0)             {                 for (int j = 0;                           j < mat.GetLength(1); j++)                     Console.Write(mat[i, j] + " ");             // If current row is              // odd, print from              // right to left             }             else             {                 for (int j = mat.GetLength(1) - 1;                           j >= 0; j--)                     Console.Write(mat[i, j] + " ");             }         }     }     // Driver code     public static void Main()     {         int [,]mat = {{ 10, 20, 30, 40 },                       { 15, 25, 35, 45 },                       { 27, 29, 37, 48 },                       { 32, 33, 39, 50 }};         print(mat);     } } // This code is contributed // by ChitraNayal ``` ## PHP ```php <?php // PHP program to print  // matrix in snake order $M= 4; $N =4; function printLN($mat) {     global $M;     global $N;     // Traverse through all rows     for ($i = 0; $i < $M; $i++)      {         // If current row is even,          // print from left to right         if ($i % 2 == 0)          {             for ($j = 0; $j < $N; $j++)                 echo $mat[$i][$j], " ";         // If current row is odd,          // print from right to left         }          else          {             for ($j = $N - 1; $j >= 0; $j--)                 echo $mat[$i][$j] , " ";         }     } } // Driver code $mat = array(array(10, 20, 30, 40),              array(15, 25, 35, 45),              array(27, 29, 37, 48),              array(32, 33, 39, 50)); printLN($mat); // This code is contributed by ajit  ?> ``` **输出**： ``` 10 20 30 40 45 35 25 15 27 29 37 48 50 39 33 32 ```