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Accepted: : 20
#5736: taniya
Accepted: : 20
$$\prod_{n=1}^\infty (1-x^n)=\sum_{k=-\infty}^\infty(-1)^kx^{\frac{k(3k-1)}{2}}=\sum_{k=0}^\infty(-1)^kx^{\frac{k(3k\pm 1)}{2}}$$
#5736: thedyingkai_
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CQYC
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「;」
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#5736: xiaojifang
Accepted: : 20
大家好我是小机房，又名更衣室。
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Accepted: : 19
・・ ・ー・・ ーーー ・・・ー ・ ー・ーー ーーー ・・ー
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Accepted: : 19
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Accepted: : 19
#5964: Alpha_Q
Accepted: : 19