Frequency of element query
Problem Description
Given an array A. You have some integers given in the array B. For the i-th number, find the frequency of B[i] in the array A and return a list containing all the frequencies.
Problem Constraints
1 <= |A| <= 10^5
1 <= |B| <= 10^5
1 <= A[i] <= 10^5
1 <= B[i] <= 10^5Input Format
First argument A is an array of integers.
Second argument B is an array of integers denoting the queries.Output Format
Return an array of integers containing frequency of the each element in B.Example Input
Input 1:
A = [1, 2, 1, 1]
B = [1, 2]
Input 2:
A = [2, 5, 9, 2, 8]
B = [3, 2]Example Output
Output 1:
[3, 1]
Output 2:
[0, 2]Example Explanation
Explanation 1:
The frequency of 1 in the array A is 3.
The frequency of 2 in the array A is 1.
Explanation 2:
The frequency of 3 in the array A is 0.
The frequency of 2 in the array A is 2.Output
Java
Python
JavaScript