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1.2 KiB
1.2 KiB
Find Pairs with Sum
Instructions
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.
In this exercise you must take in consideration the following:
- Ensure its possible to have positive or negative integers in the array
- Ensure each element is used only once in a pair
- Allow for multiple pairs to sum up to the target value
- Return the message "No pairs found." when no pair is present
- Return the message "Invalid target sum." if the target is invalid
- Return the message "Invalid number." if the number in the array is invalid
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.
The expected output for this input will be:
$ go run . "[1, 2, 3, 4, 5]" "6"
Pairs with sum 6: [[0 4] [1 3]]
$ go run . "[-1, 2, -3, 4, -5]" "1"
Pairs with sum 1: [[0 1] [2 3]]
$ go run . "[1, 2, 3, 4, 5]" "10"
No pairs found.
$ go run . "[1, 2, 3, 4, 20, -4, 5]" "2 5"
Invalid target sum.
$ go run . "[1, 2, 3, 4, 20, p, 5]" "5"
Invalid number: p
$