Professional C++ Assignment Help for Guaranteed Results: Expert...

C++ remains one of the most demanding programming languages taught at universities due to its low-level memory management, object-oriented paradigms, and performance-centric design. Students frequently encounter challenges when dealing with templates, concurrency, advanced data structures, and optimization techniques. This is where professional guidance becomes indispensable. At ProgrammingHomeworkHelp.com, we provide structured, ethical, and concept-driven assistance that empowers students to learn while achieving strong academic outcomes.

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Master-Level C++ Assignment Question

Design and implement a thread-safe Least Recently Used (LRU) Cache in C++ using modern C++ (C++17 or later). The cache should support O(1) time complexity for get and put operations and be safe for concurrent access by multiple threads.

Expert Solution

To achieve O(1) operations, we combine an unordered_map with a list. The list maintains usage order, while the map provides fast key-based access. Thread safety is ensured using a std::mutex.

#include <iostream>
#include <unordered_map>
#include <list>
#include <mutex>

class LRUCache {
private:
int capacity;
std::list<std::pair<int, int>> cacheList;
std::unordered_map<int, std::list<std::pair<int, int>>::iterator> cacheMap;
std::mutex mtx;

public:
explicit LRUCache(int cap) : capacity(cap) {}

int get(int key) {
std::lock_guard<std::mutex> lock(mtx);
auto it = cacheMap.find(key);
if (it == cacheMap.end())
return -1;

cacheList.splice(cacheList.begin(), cacheList, it->second);
return it->second->second;
}

void put(int key, int value) {
std::lock_guard<std::mutex> lock(mtx);
auto it = cacheMap.find(key);

if (it != cacheMap.end()) {
it->second->second = value;
cacheList.splice(cacheList.begin(), cacheList, it->second);
} else {
if (cacheList.size() == capacity) {
auto last = cacheList.back();
cacheMap.erase(last.first);
cacheList.pop_back();
}
cacheList.emplace_front(key, value);
cacheMap[key] = cacheList.begin();
}
}
};

This solution demonstrates advanced knowledge of STL containers, iterator management, and concurrency control—key competencies expected at the postgraduate level. Such assignments are routinely handled through our C++ assignment help online service, ensuring students receive submission-ready work supported by clear explanations.

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Professional C++ Assignment Help for Guaranteed Results: Expert Guidance for Academic Excellence

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