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he two elements that appear only once. tion: Time Complexity: 0(N) and Space Complexity 0(1) ample: nums = [1, 2, 1, 3, 2, 5], return [3, 5]. der of the result is not important. the above example, [5, 3] is also correct.

he two elements that appear only once. tion: Time Complexity: 0(N) and Space Complexity 0(1) ample: nums = [1, 2, 1, 3, 2, 5], return [3, 5]. der of the result is not important. the above example, [5, 3] is also correct.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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2 Given an array of numbers nums, 3 in which exactly two elements appear only once. 4 and all the other elements appear exactly twice. 5 Find the two elements that appear only once. 6 Limitation: Time Complexity: 0(N) and Space Complexity 0(1) 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 For example: Given nums = [1, 2, 1, 3, 2, 5], return [3, 5]. Note: The order of the result is not important. So in the above example, [5, 3] is also correct. Solution: 1. Use XOR to cancel out the pairs and isolate A^B 2. It is guaranteed that at least 1 bit exists in A^B since A and B are different numbers. ex) 010 111 = 101 3. Single out one bit R (right most bit in this solution) to use it as a pivot 4. Divide all numbers into two groups. One group with a bit in the position R One group without a bit in the position R 5. Use the same strategy we used in step 1 to isolate A and B from each group.
Transcribed Image Text:2 Given an array of numbers nums, 3 in which exactly two elements appear only once. 4 and all the other elements appear exactly twice. 5 Find the two elements that appear only once. 6 Limitation: Time Complexity: 0(N) and Space Complexity 0(1) 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 For example: Given nums = [1, 2, 1, 3, 2, 5], return [3, 5]. Note: The order of the result is not important. So in the above example, [5, 3] is also correct. Solution: 1. Use XOR to cancel out the pairs and isolate A^B 2. It is guaranteed that at least 1 bit exists in A^B since A and B are different numbers. ex) 010 111 = 101 3. Single out one bit R (right most bit in this solution) to use it as a pivot 4. Divide all numbers into two groups. One group with a bit in the position R One group without a bit in the position R 5. Use the same strategy we used in step 1 to isolate A and B from each group.
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