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g=x=>~~(x/10) f=(a,b)=>a+b&&a%10+b%10+19*f(g(a)/10|0,g(b)/10|0)
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g=x=>~~(x/10) f=(a,b)=>a+b&&a%10+b%10+19*f(g(a),g(b))
Try it online!
f=(a,b)=>a+b&&a%10+b%10+19*f(a/10|0,b/10|0)
g=x=>~~(x/10) f=(a,b)=>a+b?a%10+b%10+19*f=>a+b&&a%10+b%10+19*f(g(a),g(b)):0;
g=x=>~~(x/10) f=(a,b)=>a+b?a%10+b%10+19*f(g(a),g(b)):0;
