From b579f2f6c27dc12a3b85a3374683a63b9f887025 Mon Sep 17 00:00:00 2001 From: ashmichheda Date: Sat, 28 Aug 2021 11:21:18 -0700 Subject: [PATCH] add solution and testcase for 1836 --- .../java/com/fishercoder/solutions/_1836.java | 31 +++++++++++++++++++ src/test/java/com/fishercoder/_1836Test.java | 25 +++++++++++++++ 2 files changed, 56 insertions(+) create mode 100644 src/main/java/com/fishercoder/solutions/_1836.java create mode 100644 src/test/java/com/fishercoder/_1836Test.java diff --git a/src/main/java/com/fishercoder/solutions/_1836.java b/src/main/java/com/fishercoder/solutions/_1836.java new file mode 100644 index 0000000000..2631a1d69a --- /dev/null +++ b/src/main/java/com/fishercoder/solutions/_1836.java @@ -0,0 +1,31 @@ +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 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; + } + } +} diff --git a/src/test/java/com/fishercoder/_1836Test.java b/src/test/java/com/fishercoder/_1836Test.java new file mode 100644 index 0000000000..1fb98c0d0d --- /dev/null +++ b/src/test/java/com/fishercoder/_1836Test.java @@ -0,0 +1,25 @@ +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))); + } +} pFad - Phonifier reborn

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