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题目如下： Given n orders, each order consist in pickup and delivery services. Count all valid pickup/delivery possible sequences such that delivery(i) is 阅读全文
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题目如下： 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 阅读全文
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题目如下： Given an integer array arr. You have to sort the integers in the array in ascending order by the number of 1's in their binary representation an 阅读全文
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题目如下： Given an array of integers target. From a starting array, A consisting of all 1's, you may perform the following procedure : let x be the sum of 阅读全文
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题目如下： Implement the class ProductOfNumbers that supports two methods: 1. add(int num) Adds the number num to the back of the current list of numbers. 阅读全文