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->a,b{*r=0,0,w=-a*b;w=a*b;(k=*wk=*-w..-w).product(k).map{|x,y|r[w*w<=>x*x+y*y]+=1[x%a+y%b]};r[0,2]}
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->a,b{*r=0,0,w=-a*b;(k=*w..-w).product(k).map{|x,y|r[w*w<=>x*x+y*y]+=1[x%a+y%b]};r[0,2]}
Try it online!
->a,b{*r=0,0,w=a*b;(k=*-w..w).product(k).map{|x,y|r[w*w<=>x*x+y*y]+=1[x%a+y%b]};r[0,2]}
->a,b{*r=0,0,w=-a*b;[*w.stepa*b;(k=*w..-w,a)].product([*w.step(-w,b)]k).map{|x,y|r[w*w<=>x*x+y*y]+=1y|r[w*w<=>x*x+y*y]+=1[x%a+y%b]};r[0,2]}
->a,b{*r=0,0,w=-a*b;[*w.step(-w,a)].product([*w.step(-w,b)]).map{|x,y|r[w*w<=>x*x+y*y]+=1};r[0,2]}
