Accepter.cs

using System.Collections.Generic;

namespace Algorithms.Problems.StableMarriage;

public class Accepter
{
    public Proposer? EngagedTo { get; set; }

    public List<Proposer> PreferenceOrder { get; set; } = new();

    public bool PrefersOverCurrent(Proposer newProposer) =>
        EngagedTo is null ||
        PreferenceOrder.IndexOf(newProposer) < PreferenceOrder.IndexOf(EngagedTo);
}