APL (Dyalog Unicode), 33 32 bytesSBCS
{h⍵+1 0}+h←(⊢≡31 30|⊢)×21 2∨.≥-\
in: a pair in descending order
out: 2=ongoing, 1=ended, 0=invalid
tests stolen from Adám's answer
APL (Dyalog Unicode),
ngn
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