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// Two Sum — O(n) Hash Map Pattern
const twoSum = (nums, target) => {
const map = new Map();
for (let i = 0; i < nums.length; i++) {
const complement = target - nums[i];
if (map.has(complement))
return [map.get(complement), i];
map.set(nums[i], i);
}
};
 
// Runtime: O(n) · Space: O(n)
Output

$ Executing solution...

✓ Test 1: nums=[2,7,11], target=9 → [0,1] 2ms

✓ Test 2: nums=[3,2,4], target=6 → [1,2] 1ms

✓ Test 3: nums=[3,3], target=6 → [0,1] 0ms

All tests passed ✓

Runtime: 2ms — Beats 95.4%

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