#include "souvenirs.h"
#include <utility>
#include <vector>
#include <bits/stdc++.h>
using namespace std;
void buy_souvenirs(int N, long long P0) {
    int num = 0, price = P0;
    for(int i = 1; i < N - 1; i++) {
        pair<vector<int>, long long> res = transaction(price - 1);
        if(res.first.size() == 1 && !res.second)
            price -= 1;
        else if(res.first.size() == 1)
            price -= 2;
        else {
            price -= 1;
            num++;
        }
        for(int j = 0; j < i - 1; j++) {
            transaction(price);
        }
    }
    for(int i = 0; i < N - 1 - num; i++)
        transaction(price - 1);
    return;
}
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