摘要：
Police headquarter is monitoring signal on different frequency levels. They have got two suspiciously encoded strings s1 and s2 from two different fre 阅读全文
摘要：
You are given n segments on a line. There are no ends of some segments that coincide. For each segment find the number of segments it contains. Input 阅读全文
摘要：
Devu wants to decorate his garden with flowers. He has purchased n boxes, where the i-th box contains fi flowers. All flowers in a single box are of t 阅读全文