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Commit59d19a2

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Add solution and test case for 1721 (fishercoder1534#158)
* added solution and test case for 1721* merged with master* removed comments and initialized variables on new lines* add solution and testcase for 1721
1 parent1dfaab9 commit59d19a2

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2 files changed

+58
-5
lines changed

2 files changed

+58
-5
lines changed

‎src/main/java/com/fishercoder/solutions/_1721.java

Lines changed: 35 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -69,4 +69,39 @@ public ListNode swapNodes(ListNode head, int k) {
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returndummy.next;
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}
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}
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publicstaticclassSolution3 {
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publicListNodeswapNodes(ListNodehead,intk) {
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// O(n) linear time
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/*
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1. Calculate length of linked list
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2. Initialize 3 ptrs, temp1 and temp2 used for pointing to nodes at k, (len - k + 1)
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and temp3 used to iterate over the linked list
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*/
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intlength =0;
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intsecondIndex;
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ListNodetemp1 =null,temp2 =null;
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ListNodetemp3 =head;
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while(temp3 !=null){
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length++;
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temp3 =temp3.next;
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}
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secondIndex =length -k +1;
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temp3 =head;
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for(inti =1;i <=length;i++){
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if(i ==k){
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temp1 =temp3;
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}
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if(i ==secondIndex){
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temp2 =temp3;
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}
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temp3 =temp3.next;
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}
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intvalue =temp1.val;
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temp1.val =temp2.val;
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temp2.val =value;
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returnhead;
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}
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}
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}

‎src/test/java/com/fishercoder/_1721Test.java

Lines changed: 23 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -9,8 +9,9 @@
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importstaticorg.junit.Assert.assertEquals;
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publicclass_1721Test {
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privatestatic_1721.Solution1solution1;
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privatestatic_1721.Solution2solution2;
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privatestatic_1721.Solution3solution3;
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privatestatic_1721.Solution1solution1;
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privatestaticListNodeexpected;
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privatestaticListNodenode;
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privatestaticintk;
@@ -19,21 +20,38 @@ public class _1721Test {
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publicstaticvoidsetup() {
2021
solution1 =new_1721.Solution1();
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solution2 =new_1721.Solution2();
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solution3 =new_1721.Solution3();
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}
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@Test
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publicvoidtest1() {
26-
node =LinkedListUtils.contructLinkedList(newint[]{1,2,3,4,5});
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expected =LinkedListUtils.contructLinkedList(newint[]{1,4,3,2,5});
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node =newListNode(1);
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node.next =newListNode(2);
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node.next.next =newListNode(3);
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node.next.next.next =newListNode(4);
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node.next.next.next.next =newListNode(5);
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expected =newListNode(1);
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expected.next =newListNode(4);
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expected.next.next =newListNode(3);
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expected.next.next.next =newListNode(2);
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expected.next.next.next.next =newListNode(5);
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k =2;
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assertEquals(expected,solution1.swapNodes(node,k));
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assertEquals(expected,solution2.swapNodes(node,k));
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}
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3243
@Test
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publicvoidtest2() {
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node =LinkedListUtils.contructLinkedList(newint[]{1,2,3,4,5});
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expected =LinkedListUtils.contructLinkedList(newint[]{1,4,3,2,5});
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k =2;
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assertEquals(expected,solution2.swapNodes(node,k));
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}
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@Test
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publicvoidtest3(){
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node =LinkedListUtils.contructLinkedList(newint[]{90,100});
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k =2;
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expected =LinkedListUtils.contructLinkedList(newint[]{100,90});
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assertEquals(expected,solution3.swapNodes(node,k));
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}
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}

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