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								23/08/24.cpp
									
									
									
									
									
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								23/08/24.cpp
									
									
									
									
									
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#pragma once
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#include "lists.h"
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class Q24 {
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public:
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    ListNode *swapPairs(ListNode *head) {
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        if (!head || !head->next) {
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            return head;
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        }
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        ListNode *p1;
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        ListNode *p2;
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        p1 = head;
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        p2 = head->next;
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        while (!p2){
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            p1->next = p2->next;
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            p2->next = p1;
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            if(!p1->next){
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                return head;
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            }
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            p1 = p1->next;
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            p2 = p1->next;
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        }
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        return head;
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    }
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};
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