【leetcode】力扣简单题两数之和

题目

思路

代码实现

#include<iostream>
#include<unordered_map>

using namespace std;


class Solution
{
public:
	vector<int> TwoNumber(const vector<int>& nums, int target)
	{
		vector<int> number_vector;
		unordered_map<int, int> hash_table;
		for (int i = 0; i < nums.size() ; i++)
		{
			auto it = hash_table.find(target - nums[i]);
			if (it != hash_table.end())
			{
				number_vector.push_back(it->second);
				number_vector.push_back(i);
				return number_vector;
			}
			else
			{
				hash_table[nums[i]] = i;
			}
		}
	}
};

int main()
{
	Solution test;
	vector<int> number_vector = {2,6,11,12,7,8};
	vector<int> out = test.TwoNumber(number_vector, 9);
	for (auto var : out)
	{
		std::cout << "out:" << var << " " << std::endl;
	}
	return 0;
}

测试结果