摘要：
题目： On an NxN chessboard, a knight starts at the r-th row and c-th column and attempts to make exactly K moves. The rows and columns are 0 indexed, so 阅读全文
摘要：
题目： Given a binary tree, find the length of the longest path where each node in the path has the same value. This path may or may not pass through the 阅读全文