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create 1396-design-underground-system.cs #3675

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Merged
merged 1 commit into from
Oct 12, 2024
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create 1396-design-underground-system.cs #3675

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31 changes: 31 additions & 0 deletions csharp/1396-design-underground-system.cs
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Original file line number Diff line number Diff line change
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public class UndergroundSystem
{
// key: id
// value: station, time
private Dictionary<int, (string, int)> checked_in = new();
// key: start and end station
// value: total time, count
private Dictionary<(string, string), (int, int)> backlog = new();
public UndergroundSystem() { }

public void CheckIn(int id, string stationName, int t)
{
checked_in[id] = (stationName, t);
}

public void CheckOut(int id, string stationName, int t)
{
(string station, int time) = checked_in[id];
if (!backlog.TryAdd((station, stationName), (t - time, 1)))
{
(int total_time, int count) = backlog[(station, stationName)];
backlog[(station, stationName)] = (total_time + (t - time), count + 1);
}
}

public double GetAverageTime(string startStation, string endStation)
{
(int total_time, int count) = backlog[(startStation, endStation)];
return (double)total_time / count;
}
}