1.SearchIn2DMatrix.java

class Solution {
    public boolean searchMatrix(int[][] matrix, int target) {
     boolean found = false ;
     int n= matrix.length;
     int m= matrix[0].length;
 for( int i =0 ; i<n ; i++){
        for ( int  j=0 ; j<m; j++){
            if ( matrix[i][j]== target){
                found= true;
                break;
            }
        }
 }

        return found;
     
    }
}