LeetCode #705 RelativeRanks. Algorithm,알고리즘,LeetCode,Codefights,CodeSignal,코드파이트,코드시그널,예제,문제해결능력,example,c++,java,재귀,recursive,datastructure,techinterview,coding,코딩인터뷰,기술면접,연결리스트
Runtime: 264 ms, faster than 11.44% of C++ online submissions for Design HashSet.
Memory Usage: 35.8 MB, less than 98.26% of C++ online submissions for Design HashSet.
Badest performance
그냥 vector 이용해서 해시셋 개념에 맞게 대충 만들었는데 퍼포먼스가 엄청 안나옴
뭐 다른 빠른게 있는지는 나중에 찾아봄
LeetCode #705
Q.
Design a HashSet without using any built-in hash table libraries.
To be specific, your design should include these functions:
- add(value): Insert a value into the HashSet.
- contains(value) : Return whether the value exists in the HashSet or not.
- remove(value): Remove a value in the HashSet. If the value does not exist in the HashSet, do nothing.
해쉬셋을 디자인하는데, hash table 라이브러리 쓰지말고 만들어봐라
구체적으로, 이러한 함수들을 디자인 해야한다.
add(value) : 해시셋에 값을 넣는다.
contains(value) : 해시셋에 값이 있는지 없는지 반환한다.
remove(value) : 해시셋에서 값을 지운다. 없는거면 아무 일도 없다.
Example:
MyHashSet hashSet = new MyHashSet();
hashSet.add(1);
hashSet.add(2);
hashSet.contains(1); // returns true
hashSet.contains(3); // returns false (not found)
hashSet.add(2);
hashSet.contains(2); // returns true
hashSet.remove(2);
hashSet.contains(2); // returns false (already removed)
Note:
- All values will be in the range of [0, 1000000].
- The number of operations will be in the range of [1, 10000].
- Please do not use the built-in HashSet library.
모든 값들은 0 ~ 1000000 사이 값이다.
명령의 수는 1 ~ 10000 이다.
HashSet library를 쓰지 말아라
Code.. lemme see example code!!!
코드.. 예제코드를 보자!!!
class MyHashSet {
private:
vector<int> *list;
public:
/** Initialize your data structure here. */
MyHashSet() {
this->list = new vector<int>();
}
void add(int key) {
if (std::find(list->begin(), list->end(), key) == list->end()) {
list->push_back(key);
}
}
void remove(int key) {
//erase-remove idiom stl technique
list->erase(std::remove(list->begin(), list->end(), key), list->end());
}
/** Returns true if this set contains the specified element */
bool contains(int key) {
if (std::find(list->begin(), list->end(), key) != list->end()) {
return true;
}
else {
return false;
}
}
};
/**
* Your MyHashSet object will be instantiated and called as such:
* MyHashSet* obj = new MyHashSet();
* obj->add(key);
* obj->remove(key);
* bool param_3 = obj->contains(key);
*/
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