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题目如下： On an 8 x 8 chessboard, there is one white rook. There also may be empty squares, white bishops, and black pawns. These are given as characters 阅读全文
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题目如下： Given a positive integer n, return the number of all possible attendance records with length n, which will be regarded as rewardable. The answer 阅读全文
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题目如下： We are given the root node of a maximum tree: a tree where every node has a value greater than any other value in its subtree. Just as in the pr 阅读全文
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题目如下： Given an integer array with no duplicates. A maximum tree building on this array is defined as follow: Construct the maximum tree by the given a 阅读全文
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题目如下： In a town, there are N people labelled from 1 to N. There is a rumor that one of these people is secretly the town judge. If the town judge exis 阅读全文
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题目如下： Given the root node of a binary search tree (BST) and a value to be inserted into the tree, insert the value into the BST. Return the root node 阅读全文
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题目如下： Given a string S, count the number of distinct, non-empty subsequences of S . Since the result may be large, return the answer modulo 10^9 + 7. 阅读全文
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题目如下： In a given grid, each cell can have one of three values: the value 0 representing an empty cell; the value 1 representing a fresh orange; the va 阅读全文
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题目如下： In a binary tree, the root node is at depth 0, and children of each depth k node are at depth k+1. Two nodes of a binary tree are cousins if the 阅读全文
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题目如下： You are given a binary tree in which each node contains an integer value. Find the number of paths that sum to a given value. The path does not 阅读全文