#include <unordered_map>
class Solution {
  public:
    /**
     * 代码中的类名、方法名、参数名已经指定,请勿修改,直接返回方法规定的值即可
     *
     *
     * @param nums int整型vector
     * @param target int整型
     * @return int整型vector
     */
    vector<int> twoSum(vector<int>& nums, int target) {
        // write code here
        unordered_map<int, int> hash;
        for (int i = 0; i < nums.size(); ++i) {
            hash[nums[i]] = i;
        }
        for (int i = 0; i < nums.size(); ++i) {
            if (hash.count(target - nums[i])) {
                return {i, hash[target - nums[i]]};
            }
        }
        return {-1, -1};
    }
};