#1197 : Give My Text Back 时间限制:10000ms
描述 To prepare for the English exam Little Ho collected many digital reading materials. Unfortunately the materials are messed up by a malware.
It is known that the original text contains only English letters (a-zA-Z), spaces, commas, periods and newlines, …
1689: [Usaco2005 Open] Muddy roads 泥泞的路 Time Limit: 5 Sec Memory Limit: 64 MB Submit: 311 Solved: 227 [Submit][Status][Discuss]
Description Farmer John has a problem: the dirt road from his farm to town has suffered in the recent rainstorms and now contains (1 <= N <= 10,000) mud pools. Farmer John has a …