<p>Given an M x N matrix in which each row and each column is sorted in ascending order, write a method to find an element.</p> <p><strong>Example:</strong></p> <p>Given matrix:</p> <pre> [ [1, 4, 7, 11, 15], [2, 5, 8, 12, 19], [3, 6, 9, 16, 22], [10, 13, 14, 17, 24], [18, 21, 23, 26, 30] ] </pre> <p>Given target = 5, return <code>true.</code></p> <p>Given target = 20, return <code>false.</code></p>