Напиши описание на английском языке данного алгоритма, написанного на языке java: class Solution {
public int numIdenticalPairs(int[] nums) {
Map<Integer, Integer> map = new HashMap<>();
int counter = 0;
for (int num: nums) {
counter += map.getOrDefault(num, 0);
map.merge(num, 1, Integer::sum);
}
return counter;
}
}
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This Java algorithm is defined as a class called «Solution». It contains a method called «numIdenticalPairs» that takes an array of integers as its input parameter. The method first creates a HashMap object called «map» to store the frequency of each integer in the input array.
The algorithm then initializes a counter variable to 0. It then iterates through each integer in the input array using a for-each loop. For each integer, it retrieves the value associated with that key from the map using the «getOrDefault» method. If the value exists, it adds it to the counter variable.
The algorithm then updates the frequency count for that integer in the map using the «merge» method. This method combines the existing value with a new value (in this case, 1) using a provided function (in this case, Integer::sum).
Finally, the algorithm returns the counter variable, which represents the number of pairs of identical integers in the input array.