Dictionary - Return highest total transaction amounts.
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using System;
using System.Collections.Generic;
using System.Linq;
//Given a list of transaction records, where each record contains a user and an amount,
//write a function that returns the top 2 users with the highest total transaction amounts.
class MainClass {
static void Main() {
var transactions = new List<(string User, decimal Amount)>
{
("Alice", 150),
("Bob", 200),
("Alice", 300),
("David", 50),
("Bob", 100),
("Charlie", 400)
};
Dictionary<string, decimal> totalTrans = ProcessTotalTransactions(transactions);
// Sort the dictionary by value in ascending order
var sortedTransByValue = totalTrans.OrderByDescending(pair => pair.Value)
.ToDictionary(pair => pair.Key, pair => pair.Value);
int count = 0;
foreach(var trans in sortedTransByValue){
if(count == 2){
break;
}
Console.WriteLine("[{0} : {1}]", trans.Key, trans.Value);
count ++;
}
}
public static Dictionary<string, decimal> ProcessTotalTransactions(List<(string User, decimal Amount)> inputList){
Dictionary<string, decimal> transactions = new Dictionary<string, decimal>();
foreach(var input in inputList){
if(transactions.ContainsKey(input.User)){
transactions[input.User] += input.Amount;
}
else{
transactions[input.User] = input.Amount;
}
}
return transactions;
}
}
Csharp
INFO