摘要：
Continuous City Description: Some time ago Homer lived in a beautiful city. There were n blocks numbered from \(1\) to \(n\) and \(m\) directed road 阅读全文
摘要：
Painting the Array II Description: Homer likes arrays a lot. Today he is painting an array \(a_1, a_2, \dots, a_n\) with two kinds of colors, white 阅读全文