1.cpp

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