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- BEGIN{
- size=20
- #init matrix
- for (i=0; i<size; i++){
- a[size*(size+1)+i]=1
- a[size*(i+1)+i]=1
- }
- #build matrix
- for (i=size-1; i>=0; i--){
- for (j=size-1; j>=0; j--){
- a[i*(size+1)+j]=a[(i+1)*(size+1)+j]+a[i*(size+1)+j+1]
- }
- }
- print a[0]
- }
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