lemanschik/gist:79cd38230feacc156705711689acaf27

Created December 4, 2025 07:22

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awk -F"" '{for(i=1;i<=NF;i++)g[NR,i]=$i}END{do{c=0;for(y=1;y<=NR;y++)for(x=1;x<=NF;x++)if(g[y,x]=="@"){n=0;for(j=-1;j<2;j++)for(k=-1;k<2;k++)n+=(g[y+j,x+k]=="@");if(n<5){g[y,x]=".";c++}}t+=c}while(c);print t}' input_file

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