leetcode706-设计哈希映射

2022/9/2 6:24:14

本文主要是介绍leetcode706-设计哈希映射,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!

设计哈希映射

  • 哈希+链表
class MyHashMap {
    class Pair{
        int key;
        int value;
        public Pair(int key, int value){
            this.key = key;
            this.value = value;
        }
    }
    LinkedList arr[] = new LinkedList[1024];
    final static int total = 769;
    public MyHashMap() {
        for(int i = 0; i < 769; i++){
            arr[i] = new LinkedList<Pair>();
        }
    }
    
    public void put(int key, int value) {
        int hash = key % total;
        Iterator<Pair> it = arr[hash].iterator();
        while(it.hasNext()){
            Pair p = it.next();
            if(p.key == key){
                p.value = value;
                return;
            }
        }
        arr[hash].add(new Pair(key, value));
    }
    
    public int get(int key) {
        int hash = key % total;
        Iterator<Pair> it = arr[hash].iterator();
        while(it.hasNext()){
            Pair p = it.next();
            if(p.key == key){
                return p.value;
            }
        }
        return -1;
    }
    
    public void remove(int key) {
        int hash = key % total;
        Iterator<Pair> it = arr[hash].iterator();
        while(it.hasNext()){
            Pair p = it.next();
            if(p.key == key){
                it.remove();
                return;
            }
        }
    }
}


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