DSA Series Day 15: Evaluate Reverse Polish Notation in Java, Python and Rust
Day 15 of the Tekraze DSA series. Evaluate Reverse Polish Notation with a stack in O(n), with tested Java, Python and Rust code, tips and FAQs.
DSA
DSA Series Day 14: Min Stack in Java, Python and Rust
Day 14 of the Tekraze DSA series. Design a Min Stack with O(1) push, pop, top and getMin, with tested Java, Python and Rust code, tips and FAQs.
DSA Series Day 13: Valid Parentheses in Java, Python and Rust
Day 13 of the Tekraze DSA series. Solve Valid Parentheses with a stack in O(n) time, with tested Java, Python and Rust code, tips and FAQs.
DSA Series Day 12: Minimum Window Substring in Java, Python and Rust
Day 12 of the Tekraze DSA series. Solve Minimum Window Substring with a sliding window in O(m + n) time, with tested Java, Python and Rust code and FAQs.
DSA Series Day 11: Longest Repeating Character Replacement in Java, Python and Rust
Day 11 of the Tekraze DSA series. Solve Longest Repeating Character Replacement with a sliding window in O(n) time, with tested Java, Python and Rust code and FAQs.
DSA Series Day 10: Longest Substring Without Repeating Characters in Java, Python and Rust
Day 10 of the Tekraze DSA series. Solve Longest Substring Without Repeating Characters with a sliding window in O(n) time, with tested Java, Python and Rust code, tips and FAQs.
DSA Series Day 9: Container With Most Water in Java, Python and Rust
Day 9 of the Tekraze DSA series. Solve Container With Most Water with two pointers in O(n) time, with tested Java, Python and Rust code, tips and FAQs.
DSA Series Day 7: Two Sum II (Sorted Array) in Java, Python and Rust
Day 7 of the Tekraze DSA series. Solve Two Sum II on a sorted array with two pointers in O(n) time and O(1) space, with tested Java, Python and Rust code, tips and FAQs.
DSA Series Day 8: 3Sum in Java, Python and Rust
Day 8 of the Tekraze DSA series. Solve 3Sum with sorting and two pointers in O(n²) time, with tested Java, Python and Rust code, duplicate skipping tips and FAQs.
DSA Series Day 6: Valid Palindrome in Java, Python and Rust
Day 6 of the Tekraze DSA series. Solve Valid Palindrome with the two pointer pattern in O(n) time and O(1) space, with tested Java, Python and Rust code, tips and FAQs.
DSA Series Helper: Data Structures Cheat Sheet With Visuals, Big O and Java, Python and Rust Examples
A hack sheet for the Tekraze DSA series. Learn arrays, linked lists, stacks, queues, hash maps, trees, heaps, graphs and tries with visuals, a Big O cheat table, a decision table and tested Java, Python and Rust code.
DSA Series Day 5: Group Anagrams in Java, Python and Rust
Day 5 of the Tekraze DSA series. Solve Group Anagrams with a hash map, from a sorted key to a letter count key, with tested Java, Python and Rust code, tips and FAQs.