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TwoSum.cpp
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// Find indices of two numbers that add up to target#include <vector>#include <unordered_map>class Solution {public: vector<int> twoSum(vector<int>& nums, int target) { 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 {}; }};