website/content/ChapterFour/0700~0799/0705.Design-HashSet.md
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.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:
[0, 1000000].[1, 10000].不使用任何内建的哈希表库设计一个哈希集合具体地说,你的设计应该包含以下的功能:
注意:
add(value),contains(value),remove(value),这 3 个方法。
package leetcode
type MyHashSet struct {
data []bool
}
/** Initialize your data structure here. */
func Constructor705() MyHashSet {
return MyHashSet{
data: make([]bool, 1000001),
}
}
func (this *MyHashSet) Add(key int) {
this.data[key] = true
}
func (this *MyHashSet) Remove(key int) {
this.data[key] = false
}
/** Returns true if this set contains the specified element */
func (this *MyHashSet) Contains(key int) bool {
return this.data[key]
}
/**
* Your MyHashSet object will be instantiated and called as such:
* obj := Constructor();
* obj.Add(key);
* obj.Remove(key);
* param_3 := obj.Contains(key);
*/