12 2019 档案
摘要:题面 There is a company that has N employees(numbered from 1 to N),every employee in the company has a immediate boss (except for the leader of whole co
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摘要:学习set,其他容器每次都要去sort(),除了堆(但其无法lower_bound) 题面 During the War of Resistance Against Japan, tunnel warfare was carried out extensively in the vast areas
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