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main(j,i){char p[512];gets(p);for(;j--+1;puts(""))for(i=0-j;p[i]*p[i-1];i+=2)putchar(p[i]);}

Runtime error #stdin #stdout 0.01s 1724KB

stdin

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abcdefghijklm

stdout

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acegikm
bdfhjl

https://ideone.com/qZoTK8

language:

C (gcc 8.3)

created:

visibility:

public

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