摘要：
Problem Description A DFS(digital factorial sum) number is found by summing the factorial of every digit of a positive integer. For example ,consider 阅读全文
摘要：
Problem Description The GeoSurvComp geologic survey company is responsible for detecting underground oil deposits. GeoSurvComp works with one large re 阅读全文
摘要：
Problem Description There is a rectangular room, covered with square tiles. Each tile is colored either red or black. A man is standing on a black til 阅读全文
