day 2, part 2!

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sejo 2021-12-20 12:14:52 -06:00
parent b4b2a6b675
commit 89d71d4946
1 changed files with 68 additions and 0 deletions

68
20/20_2.awk Normal file
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BEGIN{ RS = ""; FS="" }
NR==1{
for(i=1;i<=NF;i++){
en[i-1] = $i=="#" ? 1 : 0
}
RS = "\n"
next
}
{
for(i=-1;i<=NF+2;i++){
if(i>=1 && i<=NF)
inp[i,NR-1] = $i=="#" ? 1 : 0
else
inp[i,NR-1] = 0
}
}
function wintonum(px,py){
nbit = 8; num=0
for(j=py-1;j<=py+1;j++){
for(i=px-1;i<=px+1;i++){
b = inp[i,j]=="" ? 0 : inp[i,j]
num += lshift( b, nbit)
nbit--
}
}
return num
}
function wintonum2(px,py,pss){
nbit = 8; num=0
for(j=py-1;j<=py+1;j++){
for(i=px-1;i<=px+1;i++){
b = inp[i,j]=="" ? (pss%2==0? en[0] : 0 ) : inp[i,j]
num += lshift( b, nbit)
nbit--
}
}
return num
}
END{
xmin=-1; xmax=NF+2
ymin=-1; ymax=NR+1
for(pass=1;pass<=50;pass++){
count = 0
for(y=ymin-pass; y<=ymax+pass; y++){
for(x=xmin-pass; x<=xmax+pass; x++){
wn = (pass==1) ? wintonum(x,y) : wintonum2(x,y,pass)
newinp[x,y] = en[ wn ]
count += en[ wn ]
# printf "%c", newinp[x,y]==1? "#" : "."
}
# print ""
}
print "pass",pass,"count:",count
delete inp
# copy result
for(p in newinp) inp[p] = newinp[p]
delete newinp
}
}