Bank of America Coding Questions - DSA Problems & Solutions

Company Overview

This page contains Bank of America coding questions from Bank of America OA placement papers with detailed solutions.

Coding Focus

Bank of America OA coding section includes 2-3 problems focusing on DSA and financial technology concepts. Master arrays, trees, graphs, and system design to succeed.

Bank of America Coding Questions Overview

Bank of America OA Coding Section:

• Problems: 2-3 coding problems
• Time: 90 minutes
• Languages: Java, Python

Coding Problems

Question 1: Account Balance Management

Q1: Manage multiple bank accounts with balance updates and transaction history.

Solution (Java):

class BankAccountManager {
    Map<String, Double> accounts = new HashMap<>();
    Map<String, List<Transaction>> history = new HashMap<>();

    public boolean transfer(String from, String to, double amount) {
        if (!accounts.containsKey(from) || !accounts.containsKey(to)) {
            return false;
        }

        double fromBalance = accounts.get(from);
        if (fromBalance < amount) return false;

        accounts.put(from, fromBalance - amount);
        accounts.put(to, accounts.get(to) + amount);

        history.putIfAbsent(from, new ArrayList<>());
        history.putIfAbsent(to, new ArrayList<>());
        history.get(from).add(new Transaction("DEBIT", amount));
        history.get(to).add(new Transaction("CREDIT", amount));

        return true;
    }

    public double getBalance(String accountId) {
        return accounts.getOrDefault(accountId, 0.0);
    }
}

Time Complexity: O(1) per transaction

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