#include "souvenirs.h"
#include <bits/stdc++.h>
using namespace std;
void buy_souvenirs(int N, long long P0) {
if(N == 2) {
std::pair<std::vector<int>, long long> res = transaction(P0-1);
} else if(N == 3) {
std::pair<std::vector<int>, long long> res = transaction(P0-1);
if(res.first.size() == 1) {
int p1 = P0-1-res.second;// a > b > c // b+c+x=a-1 => c = a-1-x-b
std::pair<std::vector<int>, long long> res1 = transaction(p1-1);
transaction(p1-res1.second-1);
} else {
transaction(P0-3-res.second);// 8 3 1
}
} else {
for(int i = 1; i < N; i++) {
for(int j = 0; j < i; j++) {
transaction(N-i);
}
}
}
return;
}
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