# Leetcode - Top K Frequent Elements

violet posted @ Jul 23, 2020 08:28:32 AM in 算法 with tags Algorithm Heap Java , 10840 阅读

https://leetcode.com/problems/top-k-frequent-elements/

Given a non-empty array of integers, return the k most frequent elements.

Example 1:

```Input: nums = [1,1,1,2,2,3], k = 2
Output: [1,2]
```

Example 2:

```Input: nums = [1], k = 1
Output: [1]```

```class Solution {
public int[] topKFrequent(int[] nums, int k) {
PriorityQueue<Num> pq = new PriorityQueue<>(Collections.reverseOrder());
Map<Integer, Integer> map = new HashMap<>();
for (int n : nums) {
if (map.containsKey(n)) {
map.put(n, map.get(n)+1);
} else {
map.put(n, 1);
}
}
for (int i : map.keySet()) {
}
int len = k;
if (pq.size() < k) len = pq.size();
int[] result = new int[len];
for (int i = 0; i < k && !pq.isEmpty(); i++) {
Num num = pq.poll();
int n = num.num;
int freq = num.freq;
result[i] = num.num;
}
return result;
}
private class Num implements Comparable<Num> {
public int num;
public int freq;
public Num(int num, int freq) {
this.num = num;
this.freq = freq;
}
@Override
public int compareTo(Num that) {
return this.freq - that.freq;
}
}
}```
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