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Oct 2nd, 2017
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  1. BEGIN{
  2.     size=20
  3. #init matrix
  4.     for (i=0; i<size; i++){
  5.         a[size*(size+1)+i]=1
  6.         a[size*(i+1)+i]=1
  7.     }
  8. #build matrix
  9.     for (i=size-1; i>=0; i--){
  10.         for (j=size-1; j>=0; j--){
  11.             a[i*(size+1)+j]=a[(i+1)*(size+1)+j]+a[i*(size+1)+j+1]
  12.         }
  13.     }
  14.     print a[0]
  15. }
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