// ASCII Peppa Pig by Milo Yip #include <stdio.h> #include <math.h> #include <stdlib.h> #define T double T c(T x, T y, T r) { return sqrt(x * x + y * y) - r; } T u(T x, T y, T t) { return x * cos(t) + y * sin(t); } T v(T x, T y, T t) { r
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E. Pig and Palindromes Peppa the Pig was walking and walked into the forest. What a strange coincidence! The forest has the shape of a rectangle, consisting of n rows and m columns. We enumerate the rows of the rectangle from top to bottom with numbe
题目链接: 570 E. Pig and Palindromes 题目描述: 有一个n*m的矩阵,每个小格子里面都有一个字母.Peppa the Pig想要从(1,1)到(n, m).因为Peppa the Pig是一个完美主义者,她想要她所经过的路径上的字母组成的字符串是一个回文串,现在Peppa the Pig想要知道有多少满足条件的走法? 解题思路: 因为经过路径上的字母要组成回文串,所以可以从(1,1),(n,m)同时开始dp.从(1,1)出发只能向下方和右方走,从(n,m)出发只能向上
E. Pig and Palindromes Peppa the Pig was walking and walked into the forest. What a strange coincidence! The forest has the shape of a rectangle, consisting of n rows and m columns. We enumerate the rows of the rectangle from top to bottom with num
time limit per test4 seconds memory limit per test256 megabytes inputstandard input outputstandard output Peppa the Pig was walking and walked into the forest. What a strange coincidence! The forest has the shape of a rectangle, consisting of n rows