Introduction - If you have any usage issues, please Google them yourself
In the n-n chessboard (for example, n = 5), assuming a knight (in chess in the " horse to go on" walk method) from the initial coordinates (x1, y1) starting to visited (Parade) Each board in the first place. Please compile a program to solve for the Knight Parade " road map" (or tell the knight, starting from a position, you can not visited the board- problem has no solution.)