#include <iostream>
#include <vector>
std::pair<std::vector<int>, long long> transaction(long long M);
void buy_souvenirs(int N, long long P0) {
    for (int i = 1; i < N; i++) {
        for (int j = 0; j < i; j++) {
            transaction(P0 - i);
        }
    }
}
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