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domperor/kagamimochi.tex

Last active September 24, 2019 09:06
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AtCoder Beginners Selection 7. ABC 085 B - Kagami Mochi solved in plain TeX
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kagamimochi.tex
\read-1to\N
\newcount\n
\n\N
\newcount\c
\def\loop{\read-1to\I
\expandafter\ifx\csname\I\endcsname\relax
\expandafter\def\csname\I\endcsname{}\advance\c1
\fi
\ifnum\the\n>1\advance\n-1\loop\fi}
\loop
\immediate\write16{\the\c}
\end
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