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-2 bytes thanks to ovs
lambda a,b:~-a*(a*b%2)and([0,a/2,b/2)or(0,0)b/2][a>1==a*b%2::2]
Try it online!Try it online!
lambda a,b:~-a*(a*b%2)and(a/2,b/2)or(0,0)
Try it online!
lambda a,b:[0,a/2,0,b/2][a>1==a*b%2::2]
