leetcode

Solution to some Leetcode problems written in C++
git clone git://git.dimitrijedobrota.com/leetcode.git
Log | Files | Refs | README | LICENSE
commit c926f8287222d08199836081520b25db1c3c058c
parent fcbe5a5631c5a8bd65ff903744f1595198996e66
author Dimitrije Dobrota < mail@dimitrijedobrota.com >
date Tue, 18 Jul 2023 21:00:49 +0200

Daily Problem

Diffstat:
A Problems/0146.cpp | +++++++++++++++++++++++++++++++++++++
M README.md | +

2 files changed, 38 insertions(+), 0 deletions(-)

diff --git a/ Problems/0146.cpp b/ Problems/0146.cpp

@@ -0,0 +1,37 @@

class LRUCache {
unordered_map<int, pair<int, int>> um;
queue<pair<int, int>> q;
int capacity;

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

int get(int key) {
auto it = um.find(key);
if (it == um.end()) return -1;
q.push({key, ++it->second.first});
return it->second.second;
}

void put(int key, int value) {
auto it = um.find(key);
if (it != um.end()) {
q.push({key, ++it->second.first});
it->second.second = value;
return;
}

if (um.size() == capacity) {
while (true) {
auto [key, time] = q.front();
q.pop();
if (um[key].first == time) {
um.erase(key);
break;
}
}
}
q.push({key, 0});
um[key] = {0, value};
}
};

diff --git a/ README.md b/ README.md

@@ -152,6 +152,7 @@ for solving problems.

| 0143 | Medium | [Reorder List](Problems/0143.cpp) |
| 0144 | Medium | [Binary Tree Preorder Traversal](Problems/0144.cpp) |
| 0145 | Easy | [Binary Tree Postorder Traversal](Problems/0145.cpp) |
| 0146 | Medium | [LRU Cache](Problems/0146.cpp) |
| 0148 | Medium | [Sort List](Problems/0148.cpp) |
| 0149 | Hard | [Max Points on a Line](Problems/0149.cpp) |
| 0150 | Medium | [Evaluate Reverse Polish Notation](Problems/0150.cpp) |