Find All Pairs of Integers
Reported by candidates from Salesforce's online assessment. Pattern, common pitfall, and the honest play if you blank under the timer.
Salesforce hit candidates with "Find All Pairs of Integers" in September 2024, and it's a classic two-pointer or hash-table play depending on the exact constraint. You've got an OA in the next 48 hours and you need to know if this is about pairing elements that sum to a target, finding distinct pairs, or matching based on some other property. The problem title alone doesn't give you the full picture, but the pattern is almost certainly array iteration plus either a sorted two-pointer scan or a hash lookup. StealthCoder will read the exact wording on your screen and point you to the right approach when you're live.
Pattern and pitfall
Without the full problem text, the most likely scenario is a two-pointer problem (if sorted) or a hash-table problem (if you need frequency counting or fast lookups). If it's two-pointer: sort the array, use left and right pointers, move inward based on the sum or difference. If it's hash-table: iterate once, store seen values or counts, check each element against what you've stored. The gotcha is usually handling duplicates. You need to know if the problem wants distinct pairs, or all pairs, or pairs with a specific sum. If you're asked for pairs summing to a target and the array is small, brute force O(n squared) with early termination can pass. StealthCoder reading the screen will let you spot the exact constraint and dodge the duplicate-handling trap if you blank on the approach.
Memorize the pattern. If you can't, run StealthCoder. The proctor sees the IDE. They don't see what's behind it.
You can drill Find All Pairs of Integers cold, or you can hedge it. StealthCoder runs invisibly during screen share and surfaces a working solution in under 2 seconds. The proctor sees the IDE. They don't see what's behind it. Made by an engineer who treats the OA as theater. If yours is tonight, you don't have time to grind. You have time to hedge.
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This OA pattern shows up on LeetCode as two sum. If you have time before the OA, drill that.
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Salesforce reuses patterns across OAs. Made by an engineer who treats the OA as theater. If yours is tonight, you don't have time to grind. You have time to hedge. Works on HackerRank, CodeSignal, CoderPad, and Karat.
Find All Pairs of Integers FAQ
What's the most likely constraint for a Salesforce pairs problem?+
Either find all pairs that sum to a target value, or find pairs matching a specific condition. Two-pointer works if you can sort; hash-table works if you need O(n) and can't modify input. Check the exact wording on the OA to know which.
Should I sort the array or use a hash map?+
Sorting lets you use two pointers and handle duplicates cleanly. A hash map is faster and works on unsorted data. If the problem says "pairs" without mentioning sorted output, hash map is often safer. Read the output format on the OA first.
How do I avoid counting duplicate pairs?+
Skip over duplicate values after processing them, or use a set to track pairs you've already added. If using two pointers, move past all equal values at once. If using a hash map, be careful with the condition that lets you store each value only once.
Can I brute force this on Salesforce OAs?+
Depends on the array size. If n is under 1000, O(n squared) with early termination can work. For larger inputs, hash map or two-pointer is expected. The problem text on the OA will hint at the size.
What's the trick if I blank during the live OA?+
Start with the hash map approach: iterate, store values, check. It's slower on space but faster to code and less error-prone than two-pointer logic. StealthCoder will have the full problem and can suggest the optimal pattern if you need a safety net.