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Two Sum
✓ Accepted · 42 ms
AI Interview
Confidence 92%
7-day streak
+120 XP today
Accuracy 87%
+12% this week
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Microsoft
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prepbus.dev — Code Editor
def two_sum(nums, target):
    seen = {}
    for i, n in enumerate(nums):
        if target - n in seen:
            return [seen[target - n], i]
        seen[n] = i
    return []

# Run tests
print(two_sum([2,7,11,15], 9))  # [0,1]
Acceptedruntime: 42 ms · beats 91%
Test 1✓ passed
Test 2✓ passed
Test 3✓ passed
Edge case✓ passed
AI hint

Nice O(n) hash-map approach. Try the O(1) memory variant next.

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Sanjay T.
Fresher · TCS Digital

"The resume builder's ATS score jumped my callbacks from 2 to 11 in a fortnight."

M
Meera R.
PO @ Swiggy

"Full-length mocks with real cutoffs made exam day feel like just another practice session."

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Arjun V.
Banking · IBPS PO

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