Logical misunderstanding

Little Petya very much likes gifts. Recently he has received a new laptop as a New Year gift from his mother. He immediately decided to give it to somebody else as what can be more pleasant than giving somebody gifts. And on this occasion he organized a New Year party at his place and invited n his friends there.

If there's one thing Petya likes more that receiving gifts, that's watching others giving gifts to somebody else. Thus, he safely hid the laptop until the next New Year and made up his mind to watch his friends exchanging gifts while he does not participate in the process. He numbered all his friends with integers from 1 to n. Petya remembered that a friend number i gave a gift to a friend number pi. He also remembered that each of his friends received exactly one gift.

Now Petya wants to know for each friend i the number of a friend who has given him a gift.

Input
The first line contains one integer n (1 ≤ n ≤ 100) — the quantity of friends Petya invited to the party. The second line contains n space-separated integers: the i-th number is pi — the number of a friend who gave a gift to friend number i. It is guaranteed that each friend received exactly one gift. It is possible that some friends do not share Petya's ideas of giving gifts to somebody else. Those friends gave the gifts to themselves.

Output
Print n space-separated integers: the i-th number should equal the number of the friend who gave a gift to friend number i.

Examples
input
4
2 3 4 1
output
4 1 2 3
input
3
1 3 2
output
1 3 2
input
2
1 2
output
1 2



That's a problem I was trying to solve earlier and that's my code:

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#include <bits/stdc++.h>


#define fl(n) for(int i = 0; i < n; i++)


#define ll long long
#define nl endl
#define init -9999
#define INF 1e9
#define u unsigned


using namespace std;

int main()
{

    int frds,gifts;

    cin >> frds;
    int nums[frds];

    for(int i = 0; i < frds; i++)
    {

        cin >> gifts;


        nums[gifts-1] = i+1;

    }

    for(auto c : nums)
        //if(c != 0)
        cout << c << " ";


    return 0;
}


The part nums[gifts-1] = i+1;
I got by many trials and errors and I honestly don't know why THIS one worked and all the other tries didn't, I also saw it in many diff solutions and I don't understand why this specific statement works well.
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