leetcode

Solution to some Leetcode problems written in C++
git clone git://git.dimitrijedobrota.com/leetcode.git
Log | Files | Refs | README | LICENSE |
commit892ece7ba6ed097f987cc1c7863f832d6f96d419
parentb73ec999fe29108f8edd0f74d4864262487e808d
authorDimitrije Dobrota <mail@dimitrijedobrota.com>
dateFri, 15 Dec 2023 20:44:09 +0000

1 Random Problem

Diffstat:
AProblems/0380.cpp|+++++++++++++++++++++++++++
MREADME.md|+

2 files changed, 28 insertions(+), 0 deletions(-)

diff --git a/Problems/0380.cpp b/Problems/0380.cpp

@@ -0,0 +1,27 @@

class RandomizedSet {
public:
RandomizedSet() {}
bool insert(int val) {
if (um.count(val)) return false;
nums.emplace_back(val);
um[val] = nums.size() - 1;
return true;
}
bool remove(int val) {
if (!um.count(val)) return false;
int last = nums.back();
um[last] = um[val];
nums[um[val]] = last;
nums.pop_back();
um.erase(val);
return true;
}
int getRandom() { return nums[rand() % nums.size()]; }
private:
vector<int> nums;
unordered_map<int, int> um;
};

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

@@ -282,6 +282,7 @@ for solving problems.

| 0376 | Medium | [Wiggle Subsequence](Problems/0376.cpp) |
| 0377 | Medium | [Combination Sum IV](Problems/0377.cpp) |
| 0378 | Medium | [Kth Smallest Element in a Sorted Matrix](Problems/0378.cpp) |
| 0380 | Medium | [Insert Delete GetRandom O(1)](Problems/0380.cpp) |
| 0382 | Medium | [Linked List Random Node](Problems/0382.cpp) |
| 0383 | Easy | [Ransom Note](Problems/0383.cpp) |
| 0384 | Medium | [Shuffle an Array](Problems/0384.cpp) |