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