LeetCode 597: Friend Requests I: Overall Acceptance Rate Solution

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597. Friend Requests I: Overall Acceptance Rate

Easy

Database

Problem Explanation

Explanation

To solve this problem, we need to calculate the overall acceptance rate for friend requests. The acceptance rate for a person is defined as the number of accepted friend requests divided by the total number of sent friend requests. The overall acceptance rate is the average acceptance rate of all people.

We will iterate through the input arrays to calculate the acceptance rate for each person and then compute the average acceptance rate.

Algorithm:

Initialize variables totalAccepted and totalRequests to store the total number of accepted friend requests and total number of sent friend requests respectively.
Iterate through the input arrays:
- For each person, calculate the acceptance rate by dividing the number of accepted requests by the number of sent requests.
- Add the number of accepted requests to totalAccepted and the number of sent requests to totalRequests.
Calculate the overall acceptance rate by dividing totalAccepted by totalRequests.

Time Complexity: O(n) where n is the total number of elements in the input arrays. Space Complexity: O(1)

Solution Code

class Solution {
    public double overallAcceptanceRate(int[] ids, int[] senders, int[] accepters) {
        int totalAccepted = 0;
        int totalRequests = 0;
        
        for (int i = 0; i < ids.length; i++) {
            if (senders[i] != accepters[i]) {
                totalRequests++;
            }
            if (ids[i] == accepters[i]) {
                totalAccepted++;
            }
        }
        
        return totalAccepted / (double) totalRequests;
    }
}

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