题解 | #数组中出现次数超过一半的数字#

using System;
using System.Collections.Generic;


class Solution {
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     *
     * @param numbers int整型一维数组
     * @return int整型
     */
    public int MoreThanHalfNum_Solution (List<int> numbers) {
        // write code here
        int len = numbers.Count / 2;
        Dictionary<int, int> dic = new Dictionary<int, int>();
        for (int i = 0; i < numbers.Count; i++) {
            if (dic.ContainsKey(numbers[i])) {
                dic[numbers[i]] += 1;
            } else {
                dic.Add(numbers[i], 1);
            }
        }
        foreach (var item in dic) {
            if (item.Value > len) {
                return item.Key;
            }
        }
        return -1;
    }
}