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f(a,b)=[l[1]-i|i<-[1..#a],l=[j|j<-[i..#a],a[j]==b]]
Try it online!
f(a,b)=s=t=0;Vecrev=s=t=0;r=Vecrev;r([s=!d*s++|c<-Vecrevr(a),t+=d=c==b])
Try it online!Try it online!
f(a,b)=s=t=0;Vecrev([s=!d*s++|c<-Vecrev(a),t+=d=c==b])
f(a,b)=s=t=0;r=Vecrev;r([s=!d*s++|c<-r(a),t+=d=c==b])
