Problem 给你2*n的格子,每个格子有一个字母,从任意一点出发,不重复的经过上下左右,生成要求的字符串.问有几种不同的走法. Solution 分三段,左U型.中间.右U型. 分别枚举左边和右边的长度,中间一段用Dp来解决. Dp[i][j][k],i,j,k表示当前在(i,j)位置,枚举到第k个字符. Notice 特殊情况下有重复. Code #include<cmath> #include<cstdio> #include<cstring> #include…

Puzzle Lover CodeForces - 613E Oleg Petrov loves crossword puzzles and every Thursday he buys his favorite magazine with crosswords and other word puzzles. In the last magazine Oleg found a curious puzzle, and the magazine promised a valuable prize f…