#pragma once

#include "record.hpp"
#include <map>
#include <vector>

using DayIndex = long long;

std::map<DayIndex, std::vector<Record>> group_by_day(const std::vector<Record>& recs);
std::vector<std::vector<DayIndex>> split_days(const std::map<DayIndex, std::vector<Record>>& days, int parts);