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shorter recursive code?

Posted by azma at 2009-10-23 20:40:41 on Problem 3673 
A,B,r=0;f(a,b){if(b){r+=(a%10)*(b%10);f(a,b/10);}else if(a)f(a/10,B);}main(){scanf("%d%d",&A,&B);f(A,B);printf("%d",r);}
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