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Merge pull request #122 from thecoderebel/thecoderebel-patch-1

Create #34- swap-nodes.cpp

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	`1`	`+//Problem statement`
	`2`	`+`
	`3`	`+//Given a linked list, swap every two adjacent nodes and return its head. You must solve the problem without modifying the values in the list's nodes (i.e., only nodes themselves may be changed.)`
	`4`	`+//Example-`
	`5`	`+`
	`6`	`+//Input: 1->2->3->4`
	`7`	`+//Output: 2->1->4->3`
	`8`	`+`
	`9`	`+//Solution`
	`10`	`+`
	`11`	`+class Solution {`
	`12`	`+public:`
	`13`	`+ ListNode* swapPairs(ListNode* head) {`
	`14`	`+ if(!head or !head->next){`
	`15`	`+ return head;`
	`16`	`+ }`
	`17`	`+ //Check and replace the node to its next node`
	`18`	`+ ListNode*a= head;`
	`19`	`+ ListNode*b= head;`
	`20`	`+ b= a->next;`
	`21`	`+ a->next= b->next;`
	`22`	`+ b->next= a;`
	`23`	`+ head= b;`
	`24`	`+ //Swap the node`
	`25`	`+ a->next= swapPairs(a->next);`
	`26`	`+ return head;`
	`27`	`+`
	`28`	`+ }`
	`29`	`+};`

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