摘要：
Discription Mahmoud has an array a consisting of n integers. He asked Ehab to find another arrayb of the same length such that: b is lexicographically 阅读全文
摘要：
Discription Ehab has an array a of n integers. He likes the bitwise-xor operation and he likes to bother Mahmoud so he came up with a problem. He gave 阅读全文
摘要：
Discription Ehab is interested in the bitwise-xor operation and the special graphs. Mahmoud gave him a problem that combines both. He has a complete g 阅读全文