C++代码:
class Solution {
public:
vector<int> twoSum(vector<int>& nums, int target) {
unordered_map<int, int> num;
vector<int> rec;
for (int i = 0; i < nums.size(); i++)
{
if (num.count(target - nums[i]))
{
rec.push_back(num[target - nums[i]]);
rec.push_back(i);
}
num[nums[i]] = i;
}
return rec;
}
};
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