Zigzag by notogawa

main=interact f
f(m:s)=unlines[[s!!(0^(mod(y-x)(2*n)*mod(y+x)(2*n)))|x<-[0..2*n^2+y]]|n+1<-[read[m]],y<-[0..n]]

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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