Limhhhhh的博客

F - 炮兵阵地Time Limit:2000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64uSubmit StatusDescription司令部的将军们打算在N*M的网格地图上部署他们的炮兵部队。一个N*M的地图由N行M列组成，地图的每一格可能是山地（用"H" 表示），也可能是

A - BracketsTime Limit:1000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64uSubmit StatusDescriptionWe give the following inductive definition of a “regular bracket

D - Multiplication PuzzleTime Limit:1000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64uSubmit StatusDescriptionThe multiplication puzzle is played with a row of car

F - Palindrome subsequenceIn mathematics, a subsequence is a sequence that can be derived from another sequence by deleting some elements without changing the order of the remaining elements

B - Cheapest PalindromeTime Limit:2000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64uSubmit StatusDescriptionKeeping track of all the cows can be a tricky task so F