摘要：
With fast developments of information and communication technology, many cities today have established bicycle sharing systems. The key component of t 阅读全文
摘要：
In a two dimensional array of integers of size 2×n2 \times n2×n, is it possible to rearrange integers so that the sum of two adjacent elements (which 阅读全文
摘要：
题目描述 In a 10-dollar shop, everything is worthy 10 dollars or less. In order to serve customers more effectively at the cashier, change needs to be pro 阅读全文