摘要：
F - Many Moves Time limit : 2sec / Memory limit : 256MB Score : 900 points Problem Statement There are N squares in a row. The squares are numbered 1, 阅读全文
摘要：
E - Ball Coloring Time limit : 2sec / Memory limit : 256MB Score : 700 points Problem Statement There are N bags, each containing two white balls. The 阅读全文