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HashMap in Java

HashMap in Java

88,6mii vizualizări18 iul. 2023

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Java program to count the occurrence of each character in a string using Hashmap - GeeksforGeeks

Java program to count the occurrence of each character in a …

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Govind Pothuraju on Instagram: "Day 20/200: How HashMap Works Internally HashMap is one of the most powerful data structures in coding interviews & real-world systems. Here’s how it works under the hood: ✅ Hashing: Key → Hash function → Index in array (bucket). ✅ Collision handling: Chaining (LinkedList/Tree in Java) or Open addressing. ✅ Time complexity: O(1) average for put/get, O(n) worst-case. ⚡ Mastering HashMap internals is a must for interviews — it shows depth, not just coding ability. F

Govind Pothuraju on Instagram: "Day 20/200: How HashMap Work…

5,1mii vizualizăriAcum 4 luni

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Govind Pothuraju on Instagram: "👉 Comment “CODE” if you want solutions in C++, Java & Python Day 34/200: LeetCode 904 — Fruit Into Baskets 🍎🍊 You are visiting a row of fruit trees represented by an integer array. You can pick only 2 types of fruits (since you have 2 baskets). Your goal: collect the maximum number of consecutive fruits before you’re forced to stop. ✅ Brute Force: Try all subarrays → O(n²) ❌ ✅ Optimal (Sliding Window + HashMap): O(n) ✅ Approach: - Use a window to store at most

Govind Pothuraju on Instagram: "👉 Comment “CODE” if you want sol…

16,4mii vizualizăriAcum 3 luni

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Sushant Kumbhar on Instagram: "🔍 Why HashMap Is Not Thread-Safe 1️⃣ No synchronization mechanism Methods like put() and get() are not synchronized. Multiple threads can update the map at the same time. 2️⃣ Unsafe resize (rehashing) operation During resize, the bucket array is restructured. Concurrent updates can corrupt bucket links. 3️⃣ Non-atomic operations put() involves multiple steps (hashing, indexing, insertion). Thread interleaving breaks operation consistency. ⚠️ Problems in Multi-Thre

Sushant Kumbhar on Instagram: "🔍 Why HashMap Is Not Thread-Safe …

13,9mii vizualizăriAcum 4 săptămâni

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Govind Pothuraju on Instagram: "👉 Comment “CODE” if you want solutions in C++, Java & Python Day 64/200: LeetCode 13 — Roman to Integer 🏛️ Convert a Roman numeral into its corresponding integer value. ⚡ Solve it efficiently using character mapping and traversal logic in O(n). Follow @codewith_govind for 200 days of DSA 🚀 #Day64DSA #LeetCode13 #RomanToInteger #StringProblems #HashMap #DSA #ProblemSolving #CodingInterview #LeetCode #CodeWithGovind #200DaysDSA #LearnDSA #Cplusplus #Java #Python

Govind Pothuraju on Instagram: "👉 Comment “CODE” if you want sol…

24,2mii vizualizăriAcum 2 săptămâni

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Govind Pothuraju on Instagram: "Day 25/200: Contains Duplicate II – LeetCode 219 ⚡ Save for interviews Given an integer array and an integer k, return true if there are two distinct indices i and j such that: nums[i] == nums[j] |i - j|

Govind Pothuraju on Instagram: "Day 25/200: Contains Duplicate II …

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