leetcode two sum

class Solution {
public:
vector<int> twoSum(vector<int> &numbers, int target)
{
vector<int>output;
int i,j;
for(i=0;i<numbers.size()-1;i++)
{
for(j=numbers.size()-1;j>i;j--)
{
if(numbers[i]+numbers[j]==target)
{
output.push_back(i+1);
output.push_back(j+1);
}
}
}
return output;
}
};