力扣返回下标算法题，本地控制台输出后为乱码

问题遇到的现象和发生背景

class部分没有问题，在调用的时候不知道出了什么问题

问题相关代码，请勿粘贴截图

#include<iostream>
#include<algorithm>
using namespace std;
class Solution {
public:
    int* thesum(int nums[], int target)
    {
        int n = sizeof(nums);
        for (int i = 0; i < n; ++i) {
            for (int j = i + 1; j < n; ++j)//遍历寻找，前后两个比较，相等就是目标然后输出下标
            {
                if (nums[i] + nums[j] == target) {
                    return new int[] {i, j};//输出下标
                }
            }
        }
        return nums;
    }
};

int main()
{
    int nums[] = {1,2,3,4};
    int target = 5;
    Solution s;
    cout << s.thesum(nums, target) << endl;
}

运行结果及报错内容

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
class Solution
{
public:
    vector<int> thesum(vector<int> nums, int target)
    {
        int n = nums.size();
        for (int i = 0; i < n - 1; ++i)
        {
            for (int j = i + 1; j < n; ++j) //遍历寻找，前后两个比较，相等就是目标然后输出下标
            {
                if (nums[i] + nums[j] == target)
                {
                    return vector<int>{i, j}; //输出下标
                }
            }
        }
        return vector<int>();
    }
};
int main()
{
    vector<int> nums = {1, 2, 3, 4};
    int target = 5;
    Solution s;
    vector<int> positions = s.thesum(nums, target);
    if (!positions.empty())
        cout << positions[0] << ' ' << positions[1] << endl;
}

$ g++ -Wall main.cpp
$ ./a.out
0 3

函数返回的是指针，输出的是地址