1using System;
2using System.Collections.Generic;
3
4public class MyHashMap {
5
6    private class Pair {
7        public int Key;
8        public int Value;
9        public Pair(int key, int value) {
10            Key = key;
11            Value = value;
12        }
13    }
14
15    private const int size = 1000;
16    private List<Pair>[] map;
17
18    public MyHashMap() {
19        map = new List<Pair>[size];
20        for (int i = 0; i < size; i++) {
21            map[i] = new List<Pair>();
22        }
23    }
24
25    private int Hash(int key) {
26        return key % size;
27    }
28
29    public void Put(int key, int value) {
30        int hashKey = Hash(key);
31        foreach (Pair pair in map[hashKey]) {
32            if (pair.Key == key) {
33                pair.Value = value;
34                return;
35            }
36        }
37        map[hashKey].Add(new Pair(key, value));
38    }
39
40    public int Get(int key) {
41        int hashKey = Hash(key);
42        foreach (Pair pair in map[hashKey]) {
43            if (pair.Key == key) {
44                return pair.Value;
45            }
46        }
47        return -1;
48    }
49
50    public void Remove(int key) {
51        int hashKey = Hash(key);
52        Pair toRemove = null;
53        foreach (Pair pair in map[hashKey]) {
54            if (pair.Key == key) {
55                toRemove = pair;
56                break;
57            }
58        }
59        if (toRemove != null) {
60            map[hashKey].Remove(toRemove);
61        }
62    }
63}

1class