LeetCode 6024. 数组中紧跟 key 之后出现最频繁的数字

题目链接：

力扣https://leetcode-cn.com/contest/biweekly-contest-73/problems/most-frequent-number-following-key-in-an-array/

class Solution {
    public int mostFrequent(int[] nums, int key) {
Map map = new HashMap<>();
        int n = nums.length;
        for(int i = 0; i < n - 1; i ++){
            if(nums[i] == key){
                if(map.containsKey(nums[i + 1])){
                    map.put(nums[i + 1], map.get(nums[i + 1]) + 1);
                }else{
                    map.put(nums[i + 1], 1);
                }
            }
        }
        int cnt = -1;
        int ans = key;
        for(Map.Entry entry: map.entrySet()){
            if(entry.getValue() > cnt){
                cnt = entry.getValue();
                ans = entry.getKey();
            }
        }
        return ans;
    }
}