<p>A majority element is an element that makes up more than half of the items in an array. Given a integers array, find the majority element. If there is no majority element, return -1. Do this in O(N) time and O(1) space.</p> <p><strong>Example 1: </strong></p> <pre> <strong>Input: </strong>[1,2,5,9,5,9,5,5,5] <strong>Output: </strong>5</pre> <p> </p> <p><strong>Example 2: </strong></p> <pre> <strong>Input: </strong>[3,2] <strong>Output: </strong>-1</pre> <p> </p> <p><strong>Example 3: </strong></p> <pre> <strong>Input: </strong>[2,2,1,1,1,2,2] <strong>Output: </strong>2 </pre>