#include "souvenirs.h"
#include <utility>
#include <vector>
#include <bits/stdc++.h>
using namespace std;
namespace sub1 {
void solve(long long P0) {
std::pair<std::vector<int>, long long> res = transaction(P0 - 1);
// return 0;
}
}
namespace sub2 {
void solve(int N) {
// int prev = P0;
for (int i = 1; i < N; ++i) {
for (int j = 1; j <= i; ++j) pair<vector<int>, long long> res = transaction(N - i);
}
// return 0;
}
}
namespace sub3 {
void solve(int N, int P0) {
int pre = P0;
for (int i = 1; i < N; ++i) {
pair<vector<int>, long long> tmp = transaction(pre - 1);
if (tmp.second == 1) {
pre = pre - 2;
} else {
--pre;
}
for (int j = 2; j <= i; ++j) {
tmp = transaction(pre);
}
}
}
}
void buy_souvenirs(int N, long long P0) {
if (N == 2) {
sub1::solve(P0);
return;
}
if (P0 == N) {
sub2::solve(N);
return;
}
sub3::solve(N, P0);
return;
}
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