return_index_pair_sum_is_equal_to_target.cpp

#include <vector>
#include <iostream>
using namespace std;
/*
 this fucntion will return the pair of index which addation is equal to target value,
 is sum of the any pair of index is not matches with the target value <-1, -1> pair will be return as an info.
 */
pair<int , int> f(vector<int>& nums , int target)
{
    size_t size = nums.size();
    for (int i= 0; i <= size ; i++)
    {
        for (int j = i ; j< size; j++)
            if (nums[i] + nums[j] == target)
                return make_pair(i, j) ;
    }
    cout << "no sum is equal to the target number :" << target << endl;
    return make_pair(-1,-1);
}

int main()
{
    vector<int> n = {2,7,11,15, 55,33,36,89,45,75,65} ;
    int target = 105;
    pair<int, int> index_position = f(n, target);
    cout << index_position.first << endl;
    cout << index_position.second << endl;
    return 0;
}