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33 lines
1.2 KiB
33 lines
1.2 KiB
7 months ago
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## Find Pairs with Sum
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### Instructions
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Write a program that finds all pairs of elements in an integer array that sum up to a given target value. The program should output a list of pairs, each representing the indices of the elements that form the pair.
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In this exercise you must take in consideration the following:
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- Ensure its possible to have positive or negative integers in the array
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- Ensure each element is used only once in a pair
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- Allow for multiple pairs to sum up to the target value
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- Return the message "No pairs found." when no pair is present
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- Return the message "Invalid target sum." if the target is invalid
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- Return the message "Invalid number." if the number in the array is invalid
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Let's consider the input `arr = [1, 2, 3, 4, 5]` and the target sum `targetSum = 6`. When we run the program, the `findPairs()` function will search for pairs in the array that sum up to `targetSum`.
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The expected output for this input will be:
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```console
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$ go run . "[1, 2, 3, 4, 5]" "6"
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Pairs with sum 6: [[0 4] [1 3]]
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$ go run . "[-1, 2, -3, 4, -5]" "1"
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Pairs with sum 1: [[0 1] [2 3]]
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$ go run . "[1, 2, 3, 4, 5]" "10"
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No pairs found.
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$ go run . "[1, 2, 3, 4, 20, -4, 5]" "2 5"
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Invalid target sum.
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$ go run . "[1, 2, 3, 4, 20, p, 5]" "5"
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Invalid number: p
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$
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```
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