题解 | #数组中出现次数超过一半的数字#

public class Solution {
    public int MoreThanHalfNum_Solution(int [] array) {
        if (array == null || array.length < 1) {
            return -1;
        }
        int n = array.length;
        int cand = 0;
        int cnt = 0;
        for (int num : array) {
            if (cnt == 0) {
                cand = num;
                cnt++;
            } else if (cand == num) {
                cnt++;
            } else {
                cnt--;
            }
        }
        cnt = 0;
        for (int num : array) {
            if (cand == num) {
                cnt++;
            }
        }
        return cnt > n / 2 ? cand : -1;
    }
}