# 定义：递归基是“停止继续分解”的条件；每次递归调用都会在 call stack 上创建一个栈帧保存参数与返回点。 # 作用 ...

node.isEnd = true; // mark this node as ending as the word has ended here. // Step 2 Do backtracking from every cell for (int row = 0; row < board.length; ++row) { for (int col = 0; col < ...