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2019

P4121[wc2005]
Codeforces Round #172 (Div. 1) - D
Codeforces Round ##FF (Div. 1) - C
hdu6635
2019牛客多校7H
2019牛客多校7E
两分数间分母最小的分数
hdu6624
P2444
hdu6625