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Merged
merged 1 commit into from
Aug 29, 2021
Merged

Add 1836 #159

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31 changes: 31 additions & 0 deletions src/main/java/com/fishercoder/solutions/_1836.java
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package com.fishercoder.solutions;

import com.fishercoder.common.classes.ListNode;

import java.util.HashSet;
import java.util.Set;

public class _1836 {
public static class Solution1 {
public ListNode removeDuplicates(ListNode head) {
// write your code here
// Maintain a hashtable to checkup for duplicate element in constant time
Set<Integer> uniqueNums = new HashSet<>();

ListNode current = head;
ListNode prev = null;
while (current != null) {
int val = current.val;
if (uniqueNums.contains(val)) {
prev.next = current.next;
}
else {
uniqueNums.add(val);
prev = current;
}
current = current.next;
}
return head;
}
}
}
25 changes: 25 additions & 0 deletions src/test/java/com/fishercoder/_1836Test.java
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package com.fishercoder;

import com.fishercoder.common.classes.ListNode;
import com.fishercoder.solutions._1836;
import org.junit.BeforeClass;
import org.junit.Test;

import java.util.Arrays;

import static org.junit.Assert.assertEquals;

public class _1836Test {
private static _1836.Solution1 solution1;
private static ListNode head;
private static ListNode result;
@BeforeClass
public static void setup() { solution1 = new _1836.Solution1(); }

@Test
public void test1() {
head = ListNode.createSinglyLinkedList(Arrays.asList(1, 2, 1, 3, 3, 5, 6, 3));
result = solution1.removeDuplicates(head);
assertEquals(result, ListNode.createSinglyLinkedList(Arrays.asList(1, 2, 3, 5, 6)));
}
}