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wtsnjp/esum_optimized.tex

Created August 17, 2019 01:10
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esum_optimized.tex
\catcode`\@=11
\def\esum#1{\x@esum{\z@}{#1}}
\def\x@hop#1\fi{\fi #1}
\def\x@esum#1#2{%
\ifnum#2<\tw@\number#1\else
\x@hop\expanded{%
\noexpand\x@esum{\the\numexpr #1+#2-\tw@}{\the\numexpr#2-\tw@}%
}\fi}
\esum{90000}\bye
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