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Leetcode146.cpp
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69 lines (57 loc) · 1.95 KB
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// Leetcode146.cpp : This file contains the 'main' function. Program execution begins and ends there.
//
#include <iostream>
class LRUCache {
public:
LRUCache(int capacity) {
size = capacity;
}
int get(int key) {
if (mapData.find(key) == mapData.end()) return -1;
listData.erase(mapData[key].first);
listData.push_back(key);
auto it = listData.end();
mapData[key].first = --it;
return mapData[key].second;
}
void put(int key, int value) {
if (mapData.find(key) != mapData.end())
{
listData.erase(mapData[key].first);
listData.push_back(key);
auto it = listData.end();
mapData[key].first = --it;
mapData[key].second = value;
}
else
{
if (mapData.size() == size)
{
int keyDelete = listData.front();
listData.pop_front();
mapData.erase(keyDelete);
}
listData.push_back(key);
auto it = listData.end();
mapData[key].first = --it;
mapData[key].second = value;
}
}
private:
int size = 0;
unordered_map<int, pair<list<int>::iterator, int>> mapData;
list<int> listData;
};
int main()
{
std::cout << "Hello World!\n";
}
// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu
// Tips for Getting Started:
// 1. Use the Solution Explorer window to add/manage files
// 2. Use the Team Explorer window to connect to source control
// 3. Use the Output window to see build output and other messages
// 4. Use the Error List window to view errors
// 5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
// 6. In the future, to open this project again, go to File > Open > Project and select the .sln file