string s = "%(%s, %)".format(a); writefln(s); }Accepted. Is it really needed to call 'writefln'? I mean 'f'.
no. it's a leftover from the code without format. it originally was `writefln("%(%s, %)", a);`, but i wanted to show `format` function too, and forgot to remove `f`. actually, it is a BUG to call `writefln` here, 'cause who knows, `s` may contain '%', and then boom! all hell broke loose. ;-)
