String Questions at Accenture: What to Expect

String questions make up over a quarter of Accenture's coding problem set (38 out of 144). This high frequency isn't random. Accenture's projects often involve data transformation, system integration, and processing user inputs—tasks where string manipulation is fundamental. Successfully handling these questions demonstrates practical, job-relevant skills in parsing, cleaning, and logically restructuring data, which is a core part of many client deliverables.

What to Expect — Types of Problems

Accenture's string problems tend to focus on applied logic rather than complex theoretical algorithms. You can expect questions that test:

• Basic Manipulation: Reversals, capitalization, checking palindromes, and anagrams.
• Parsing and Validation: Extracting information from strings (like dates, IDs, or keywords), validating formats (emails, phone numbers), and checking balanced parentheses.
• Frequency and Counting: Finding the most/least common character, counting specific substrings, or analyzing word frequency.
• String Transformation: Applying rules to modify a string, such as compressing sequences ("aaabb" becomes "a3b2") or implementing basic encryption shifts.

The problems are designed to assess your attention to detail, ability to handle edge cases, and skill in writing clean, efficient logic without over-engineering.

How to Prepare — Study Tips with One Code Example

Focus on mastering a few core techniques that apply to most problems. Use a two-pointer approach for in-place reversals or palindromes. Leverage hash maps (dictionaries, objects) for counting characters or tracking frequencies. Practice slicing and iterating through strings to build substrings.

A key pattern is using a frequency map to solve anagrams, character replacement, or uniqueness problems. Here is a standard implementation for checking if two strings are anagrams.

def are_anagrams(s1, s2):
    if len(s1) != len(s2):
        return False
    freq = {}
    for ch in s1:
        freq[ch] = freq.get(ch, 0) + 1
    for ch in s2:
        if ch not in freq or freq[ch] == 0:
            return False
        freq[ch] -= 1
    return True

Recommended Practice Order

Start with foundational problems to build confidence and pattern recognition.

1. Easy: String reversal, palindrome check, first unique character.
2. Medium: Anagram groups, string compression, basic parsing (e.g., reversing words in a string).
3. Applied Logic: Validate IP address, count and say sequence, implement strStr() (substring search).

Timebox your practice. Spend 20-25 minutes per problem, mimicking interview conditions. Always verbalize your thought process and test with edge cases like empty strings, single characters, spaces, and mixed cases.

Practice String at Accenture