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Design a HashSet without using any built-in hash table libraries.
Implement MyHashSet
class:
void add(key)
Inserts the value key
into the HashSet.bool contains(key)
Returns whether the value key
exists in the HashSet or not.void remove(key)
Removes the value key
in the HashSet. If key
does not exist in the HashSet, do nothing.
Example 1:
Input ["MyHashSet", "add", "add", "contains", "contains", "add", "contains", "remove", "contains"] [[], [1], [2], [1], [3], [2], [2], [2], [2]] Output [null, null, null, true, false, null, true, null, false] Explanation MyHashSet myHashSet = new MyHashSet(); myHashSet.add(1); // set = [1] myHashSet.add(2); // set = [1, 2] myHashSet.contains(1); // return True myHashSet.contains(3); // return False, (not found) myHashSet.add(2); // set = [1, 2] myHashSet.contains(2); // return True myHashSet.remove(2); // set = [1] myHashSet.contains(2); // return False, (already removed)
Constraints:
0 <= key <= 106
104
calls will be made to add
, remove
, and contains
.Follow up: Could you solve the problem without using the built-in HashSet library?
class MyHashSet:
def __init__(self):
"""
Initialize your data structure here.
"""
self.data = [False] * 1000001
def add(self, key: int) -> None:
self.data[key] = True
def remove(self, key: int) -> None:
self.data[key] = False
def contains(self, key: int) -> bool:
"""
Returns true if this set contains the specified element
"""
return self.data[key]
# Your MyHashSet object will be instantiated and called as such:
# obj = MyHashSet()
# obj.add(key)
# obj.remove(key)
# param_3 = obj.contains(key)
class MyHashSet {
private boolean[] data;
/** Initialize your data structure here. */
public MyHashSet() {
data = new boolean[1000001];
}
public void add(int key) {
data[key] = true;
}
public void remove(int key) {
data[key] = false;
}
/** Returns true if this set contains the specified element */
public boolean contains(int key) {
return data[key];
}
}
/**
* Your MyHashSet object will be instantiated and called as such:
* MyHashSet obj = new MyHashSet();
* obj.add(key);
* obj.remove(key);
* boolean param_3 = obj.contains(key);
*/
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