#1862Medium#35 in Oracle's list· asked at 7 companies
Swap Nodes in Pairs
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What we know
Example 1
Input: head = [1,2,3,4] Output: [2,1,4,3]
Example 2
Input: head = [] Output: []
Example 3
Input: head = [1] Output: [1]
Constraints
- •
The number of nodes in the list is in the range
[0, 100]. - •
0 <= Node.val <= 100