摘要：
Given n orders, each order consist in pickup and delivery services. Count all valid pickup/delivery possible sequences such that delivery(i) is always 阅读全文
posted @ 2020-02-25 12:09
Schwifty
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摘要：
Given a string s consisting only of characters a, b and c. Return the number of substrings containing at least one occurrence of all these characters 阅读全文
posted @ 2020-02-25 11:32
Schwifty
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摘要：
There is a sale in a supermarket, there will be a discount every n customer.There are some products in the supermarket where the id of the i-th produc 阅读全文
posted @ 2020-02-25 10:07
Schwifty
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