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-1 byfebyte thanks to @notjagan
f=lambda a,*s,m=1:m*a+(s>()and f(*s,m=(m*2)**(a==s[0])))
Try it online!
-1 byfe thanks to @notjagan
-1 byte thanks to @notjagan
f=lambda a,*s,m=1:m*a+(s>()and f(*s,m=(m*2)**(a==s[0])*m*2or 1))
Try it online!Try it online!
f=lambda a,*s,m=1:m*a+(s>()and f(*s,m=(a==s[0])*m*2or 1))
