A collection of C++ string manipulation exercises for competitive programming (OI) preparation.

exercises/
├── 01_basics/         # String initialization, concatenation, access
├── 02_operations/     # substr, find, replace, number conversion
├── 03_search/         # Advanced search operations
├── 04_regex/          # Regular expressions (std::regex)
└── 05_advanced/       # string_view, split, join, trim, prefix/suffix

python3 runner.py

python3 runner.py 01_basics/01_init.cpp

1. Each exercise file contains // FIX THIS markers
2. Read the TODO comments to understand what's needed
3. Fix the code to make assertions pass
4. Run the runner to verify

• 01_init.cpp - String constructors
• 02_concat.cpp - Concatenation (+, +=, append)
• 03_access.cpp - Character access ( [], at, front, back)
• 04_io.cpp - Input handling (>>, getline)

• 01_substr.cpp - Substring extraction
• 02_find.cpp - Finding substrings (find, npos)
• 03_replace.cpp - Replace, erase, insert
• 04_numbers.cpp - Number conversion (to_string, stoi)

• 01_search.cpp - Advanced find operations

• 01_match.cpp - regex_match for validation
• 02_search.cpp - regex_search to find all matches
• 03_replace.cpp - regex_replace with capture groups

• 01_string_view.cpp - Zero-copy string_view
• 02_manual_split.cpp - Implement split function
• 03_join.cpp - Implement join function
• 04_trim.cpp - Trim whitespace
• 05_prefix_suffix.cpp - startsWith, endsWith, stripPrefix, stripSuffix

• Python 3
• g++ with C++17 support

• Use -std=c++17 for string_view support
• std::regex can be slow in competitive programming - know when to use manual parsing instead
• string_view is crucial for OI performance (no unnecessary copies)