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Print an N x M matrix such that each row and column has all the vowels in it
• Last Updated : 04 Jun, 2019

Given two integers N and M, the task is to print an N x M matrix such that each row and column contain all the vowels in it. If it is impossible to do so, then print -1.

Examples:

Input: N = 5, M = 5
Output:
a e i o u
e i o u a
i o u a e
o u a e i
u a e i o

Input: N = 6, M = 2
Output: -1

## Recommended: Please try your approach on {IDE} first, before moving on to the solution.

Approach: Since the number of vowels are 5, hence we need a minimum of 5 rows and 5 columns in order to generate a valid matrix. A pattern can be followed by filling “aeiouaeiou..” in the first row, “eiouaeio..” in the second row and so on and the generated matrix will contain all the vowels in every row and column.

Below is the implementation of the above approach:

## C++

 `// C++ implementation of the approach``#include ``using` `namespace` `std;`` ` `// Function to print the required matrix``void` `printMatrix(``int` `n, ``int` `m)``{`` ` `    ``// Impossible to generate``    ``// the required matrix``    ``if` `(n < 5 || m < 5) {``        ``cout << -1;``        ``return``;``    ``}`` ` `    ``// Store all the vowels``    ``string s = ``"aeiou"``;`` ` `    ``// Print the matrix``    ``for` `(``int` `i = 0; i < n; i++) {`` ` `        ``// Print vowels for every index``        ``for` `(``int` `j = 0; j < m; j++) {``            ``cout << s[j % 5] << ``" "``;``        ``}``        ``cout << endl;``        ``char` `c = s[0];`` ` `        ``// Shift the vowels by one``        ``for` `(``int` `i = 0; i < 4; i++) {``            ``s[i] = s[i + 1];``        ``}`` ` `        ``s[4] = c;``    ``}``}`` ` `// Driver code``int` `main()``{``    ``int` `n = 5, m = 5;`` ` `    ``printMatrix(n, m);`` ` `    ``return` `0;``}`

## Java

 `// Java implementation of the approach``class` `GFG ``{`` ` `// Function to print the required matrix``static` `void` `printMatrix(``int` `n, ``int` `m)``{`` ` `    ``// Impossible to generate``    ``// the required matrix``    ``if` `(n < ``5` `|| m < ``5``) ``    ``{``        ``System.out.print(-``1``);``        ``return``;``    ``}`` ` `    ``// Store all the vowels``    ``char``[] s = ``"aeiou"``.toCharArray();`` ` `    ``// Print the matrix``    ``for` `(``int` `i = ``0``; i < n; i++) ``    ``{`` ` `        ``// Print vowels for every index``        ``for` `(``int` `j = ``0``; j < m; j++) ``        ``{``            ``System.out.print(s[j % ``5``] + ``" "``);``        ``}``        ``System.out.println();``        ``char` `c = s[``0``];`` ` `        ``// Shift the vowels by one``        ``for` `(``int` `k = ``0``; k < ``4``; k++) ``        ``{``            ``s[k] = s[k + ``1``];``        ``}`` ` `        ``s[``4``] = c;``    ``}``}`` ` `// Driver code``public` `static` `void` `main(String[] args) ``{``    ``int` `n = ``5``, m = ``5``;`` ` `    ``printMatrix(n, m);``}``}`` ` `// This code has been contributed by 29AjayKumar`

## Python3

 `# Python3 implementation of the approach `` ` `# Function to print the required matrix ``def` `printMatrix(n, m) : `` ` `    ``# Impossible to generate ``    ``# the required matrix ``    ``if` `(n < ``5` `or` `m < ``5``) : ``        ``print``(``-``1``,end ``=` `" "``); ``        ``return``; ``     ` ` ` `    ``# Store all the vowels ``    ``s ``=` `"aeiou"``; ``    ``s ``=` `list``(s);`` ` `    ``# Print the matrix ``    ``for` `i ``in` `range``(n) :``         ` `        ``# Print vowels for every index ``        ``for` `j ``in` `range``(m) :``            ``print``(s[j ``%` `5``],end``=` `" "``); ``     ` `        ``print``() ``        ``c ``=` `s[``0``]; `` ` `        ``# Shift the vowels by one ``        ``for` `i ``in` `range``(``4``) :``            ``s[i] ``=` `s[i ``+` `1``]; ``         ` `        ``s[``4``] ``=` `c; `` ` ` ` `# Driver code ``if` `__name__ ``=``=` `"__main__"` `: `` ` `    ``n ``=` `5``; m ``=` `5``; `` ` `    ``printMatrix(n, m); `` ` `# This code is contributed by AnkitRai01`

## C#

 `// C# implementation of the approach``using` `System;`` ` `class` `GFG ``{ `` ` `// Function to print the required matrix ``static` `void` `printMatrix(``int` `n, ``int` `m) ``{ `` ` `    ``// Impossible to generate ``    ``// the required matrix ``    ``if` `(n < 5 || m < 5) ``    ``{ ``        ``Console.Write(-1); ``        ``return``; ``    ``} `` ` `    ``// Store all the vowels ``    ``char``[] s = ``"aeiou"``.ToCharArray(); `` ` `    ``// Print the matrix ``    ``for` `(``int` `i = 0; i < n; i++) ``    ``{ `` ` `        ``// Print vowels for every index ``        ``for` `(``int` `j = 0; j < m; j++) ``        ``{ ``            ``Console.Write(s[j % 5] + ``" "``); ``        ``} ``        ``Console.WriteLine(); ``        ``char` `c = s[0]; `` ` `        ``// Shift the vowels by one ``        ``for` `(``int` `k = 0; k < 4; k++) ``        ``{ ``            ``s[k] = s[k + 1]; ``        ``} `` ` `        ``s[4] = c; ``    ``} ``} `` ` `// Driver code ``public` `static` `void` `Main(String[] args) ``{ ``    ``int` `n = 5, m = 5; `` ` `    ``printMatrix(n, m); ``} ``} `` ` `/* This code contributed by PrinciRaj1992 */`

## PHP

 ``
Output:
```a e i o u
e i o u a
i o u a e
o u a e i
u a e i o
```

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