题解 | #数组中出现次数超过一半的数字#

/**
 * 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
 */
function MoreThanHalfNum_Solution(numbers) {
    // write code here
    let map = new Map();
    for (let i = 0; i < numbers.length; i++) {
        if (map.has(numbers[i])) {
            //map.get(numbers[i]) + 1不能直接这样写，必须要用set形式
            map.set(numbers[i],map.get(numbers[i]) + 1)
        } else {
            map.set(numbers[i], 1);
        }
    }
    //console.log(map.values())
    let res = Math.floor(numbers.length / 2) + 1;

    for (let item of map) {
        if (Number(item[1]) >= res) {
            return item[0];
        }
    }
}
module.exports = {
    MoreThanHalfNum_Solution: MoreThanHalfNum_Solution,
};