LeetCode 3055: Top Percentile Fraud Solution

Master LeetCode problem 3055 (Top Percentile Fraud), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

3055. Top Percentile Fraud

Medium

Database

Problem Explanation

Explanation:

To solve this problem, we need to identify the fraudulent activities in a list of transactions based on a given threshold percentile. The threshold percentile represents the percentage of transactions that need to be considered as fraudulent. We need to return a list of indices of fraudulent transactions based on the threshold percentile.

Sort the transactions based on their amounts.
Find the threshold amount by calculating the (100 - threshold) percentile amount.
Iterate through the sorted transactions and mark the transactions as fraudulent if their amount is greater than or equal to the threshold amount. :

Solution Code

import java.util.*;

class Solution {
    public List<Integer> getFraudulentTransactions(int[] transactions, int threshold) {
        List<Integer> fraudulentIndices = new ArrayList<>();
        Arrays.sort(transactions);

        int n = transactions.length;
        int thresholdAmount = transactions[(n * (100 - threshold)) / 100];

        for (int i = 0; i < n; i++) {
            if (transactions[i] >= thresholdAmount) {
                fraudulentIndices.add(i);
            }
        }

        return fraudulentIndices;
    }
}

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