Given a string str and a matrix mat[][] of lowercase English alphabets, the task is to find whether the string str appears in the matrix (either row-wise or column-wise).
Examples:
Input: str = "GFG"
mat[][] = {{'G', 'E', 'E', 'K', 'S'},
{'F', 'O', 'R', 'A', 'N'},
{'G', 'E', 'E', 'K', 'S'}}
Output: Yes
GFG is present in the first column.
Input: str = "SSS"
mat[][] = {{'G', 'E', 'E', 'K', 'S'},
{'F', 'O', 'R', 'A', 'N'},
{'G', 'E', 'E', 'K', 'S'}}
Output: No
Approach:
If the search string is present in any row of the matrix the following results will be produced by the split function:
- If the string occupies the whole row then the split function will return an array of length zero.
- If the string is present in between characters then the array length will be greater than one.
- If the array length is one then three possible cases can be there-
- The string occurs in first half.
- The string occurs in second half.
- The string is not present in that row.
- To search the string column wise transpose the matrix and repeat step one.
- Print Yes if the string is found else print No.
Below is the implementation of the above approach:
Java
// Java program to search a string in // the matrix using split function import java.util.*; public class GFG { // Function to check the occurrence of string in the matrix public static int check(String[] matrix, String string) { // Looping the contents in the matrix for (String input : matrix) { // using split operator String[] value = input.split(string); if (value.length >= 2 || value.length == 0) { return 1; } else if (value.length == 1 && input.length() != value[0].length()) { return 1; } } return 0; } // Function to transpose the given matrix public static String[] vertical(String[] matrix) { String[] vertical_value = new String[(matrix[0].length())]; for (int i = 0; i < matrix[0].length(); i++) { String temp = ""; for (int j = 0; j < matrix.length; j++) temp += matrix[j].charAt(i); vertical_value[i] = temp; } // returning the transposed matrix return vertical_value; } // Driver code public static void main(String[] args) { // Input matrix of characters String[] matrix = { "GEEKS", "FORAN", "GEEKS" }; // element to be searched String search = "GFG"; // Transpose of the matrix String[] verticalMatrix = vertical(matrix); // Searching process int horizontal_search = check(matrix, search); int vertical_search = check(verticalMatrix, search); // If found if (horizontal_search == 1 || vertical_search == 1) System.out.println("Yes"); else System.out.println("No"); } } |
Output
Yes
Feeling lost in the world of random DSA topics, wasting time without progress? It’s time for a change! Join our DSA course, where we’ll guide you on an exciting journey to master DSA efficiently and on schedule.
Ready to dive in? Explore our Free Demo Content and join our DSA course, trusted by over 100,000 neveropen!
Ready to dive in? Explore our Free Demo Content and join our DSA course, trusted by over 100,000 neveropen!
