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Problem · Bit Manipulation

Swap Two Integers Without a Temporary Variable

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● Easy

OracleFULLTIMEONSITE INTERVIEW

Problem statement

Given two signed 32-bit integers a and b, swap their values without using a third scalar variable.

Return a two-element array [a, b] containing the values after the swap. The returned array is only the output representation; the swapping steps themselves must not store either value in a temporary scalar variable.

Function

swapWithoutTemporary(a: int, b: int) → int[]

Examples

Example 1

a = 30b = 40return = [40,30]

After the swap, a contains 40 and b contains 30.

Example 2

a = -7b = 12return = [12,-7]

The same operation works when one value is negative.

Example 3

a = 5b = 5return = [5,5]

Swapping equal values leaves the pair unchanged.

Constraints

-2147483648 <= a <= 2147483647
-2147483648 <= b <= 2147483647
Do not use a third scalar variable to hold either input value during the swap.