ProblemNest
Sign In
You are coding as a Guest. Sign in with Google in 1 tap to save your daily streak, lock in +50 XP & boost your college rank!
Save Streak (1-Tap Google)
9:00 AM Daily Incident ReleaseMaintaining a 7-day streak grants a 2.5× Recruiter Visibility Multiplier on the Recruiter Talent Radar.
Multiplier Ladder:1d: 1.0ו3d: 1.5ו7d: 2.5× MAX
🔥Two Sum: Target Pair IndexerEasy
DAILY PROBLEM OF THE DAY+50 XP • Daily Streak

Solve today's challenge or tackle one of the 3 Super Hard challenges for +150 XP.

EasyArrays & Hashing•Acceptance: 53.2%

Two Sum: Target Pair Indexer

Targeted in FAANG & Tech OA:GoogleAmazonMicrosoftSwiggyUber
Real-World Engineering Context
Used in financial order book matching at Zerodha and Razorpay to instantaneously pair matching buy and sell prices with O(n) hash map lookups.
Given an array of integers `nums` and an integer `target`, return indices of the two numbers such that they add up to `target`. You may assume that each input would have exactly one solution, and you may not use the same element twice. Return the answer in any order.

Sample Test Cases

Input: [[2,7,11,15],9]
Expected: [0,1]
Input: [[3,2,4],6]
Expected: [1,2]
Input: [[3,3],6]
Expected: [0,1]

Constraints

  • 2 <= nums.length <= 10^4
  • -10^9 <= nums[i] <= 10^9
  • -10^9 <= target <= 10^9
  • Only one valid answer exists.
Verified Proof-of-Work ATS PortfolioCryptographic Verification
Export tamper-proof problem verifications to your direct ATS applications
DevScore: Unranked (0/1000)

Every verified problem solve writes authentic cryptographic proof-of-work to your profile. Attach your verified DevScore badge to ATS applications to stand out to engineering hiring teams across 4,000+ verified live tech openings (23,000+ cumulative audited) on RoleNest.

Explore 4,000+ Direct ATS Openings on RoleNest ↗Solve Challenge to Activate Ledger