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// Pattern: Two Pointers (Target Sum Pair)
#include <vector>
#include <unordered_map>
std::vector<int> twoSum(std::vector<int>& nums, int target) {
std::unordered_map<int, int> seen;
for (int i = 0; i < nums.size(); ++i) {
int complement = target - nums[i];
if (seen.count(complement)) {
return {seen[complement], i};
}
seen[nums[i]] = i;
}
return {};
}