[其他] 離散一題
題目: https://imgur.com/a/t2rJUCV
題目裡job/candidate都有n個
(a)部分不太懂該如何下手
也不清楚Hint裡引入imaginary entities的作用
(b)部分不清楚推的合不合理
Assume 2 stable matching T1, T2
Assume (j0, c0)∈T1, j0 unmatched in T2
c0 cannot be unmatched in T2 -> rogue couple (j0, c0)
->Assume (j1, c0)∈T2
j1 cannot be unmatched in T1 -> rogue couple (j1, c0)
->Assume (j1, c1)∈T1 -> (j2, c1)∈T2 -> ... ->(jn, cn)∈T1
cn cannot be unmatched in T2, and j0 is the only unmatched in T2
-> (j0, cn)∈T2
-> contradicts to j0 unmatched in T2
-> The statement is true
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