You are asked to cut off trees in a forest for a golf event. The forest is represented as a non-negative 2D map, in this map: 0 represents the obstacle can't be reached. 1 represents the ground can be walked through. The place with number bigger than…

You are asked to cut off trees in a forest for a golf event. The forest is represented as a non-negative 2D map, in this map: 0 represents the obstacle can't be reached. 1 represents the ground can be walked through. The place with number bigger than…

原题链接在这里:https://leetcode.com/problems/cut-off-trees-for-golf-event/description/ 题目: You are asked to cut off trees in a forest for a golf event. The forest is represented as a non-negative 2D map, in this map: 0 represents the obstacle can't be reach…

You are asked to cut off trees in a forest for a golf event. The forest is represented as a non-negative 2D map, in this map: 0 represents the obstacle can't be reached. 1 represents the ground can be walked through. The place with number bigger than…

// Potential improvements: // 1. we can use vector<int> { h, x, y } to replace Element, sorting vector is to compare elements one by one. // 2. use 2-d bool vector<vector<bool>> to replace unordered_set. class Element { public: int x, y,…

You are asked to cut off trees in a forest for a golf event. The forest is represented as a non-negative 2D map, in this map: 0 represents the obstacle can't be reached. 1 represents the ground can be walked through. The place with number bigger than…

You are asked to cut off trees in a forest for a golf event. The forest is represented as a non-negative 2D map, in this map: 0 represents the obstacle can't be reached. 1 represents the ground can be walked through. The place with number bigger than…

为高尔夫比赛砍树 你被请来给一个要举办高尔夫比赛的树林砍树. 树林由一个非负的二维数组表示, 在这个数组中: 0 表示障碍,无法触碰到. 1 表示可以行走的地面. 比1大的数 表示一颗允许走过的树的高度. 你被要求按照树的高度从低向高砍掉所有的树,每砍过一颗树,树的高度变为1. 你将从(0,0)点开始工作,你应该返回你砍完所有树需要走的最小步数. 如果你无法砍完所有的树,返回 -1 . 可以保证的是,没有两棵树的高度是相同的,并且至少有一颗树需要你砍. 示例 1: 输入: [ [1,2,3],…

LeetCode:Unique Binary Search Trees Given n, how many structurally unique BST's (binary search trees) that store values 1...n? For example,Given n = 3, there are a total of 5 unique BST's. 1 3 3 2 1 \ / / / \ \ 3 2 1 1 3 2 / / \ \ 2 1 2 3 分析:依次把每个节点作…

本文原题: LeetCode. 给定 n, 求解独特二叉搜寻树 (binary search trees) 的个数. 什么是二叉搜寻树? 二叉查找树(Binary Search Tree),或者是一棵空树,或者是具有下列性质的二叉树: 若它的左子树不空,则左子树上所有结点的值均小于它的根结点的值: 若它的右子树不空,则右子树上所有结点的值均大于它的根结点的值: 它的左.右子树也分别为二叉排序树. 举个栗子,给定 n = 3, 共有 5 个. 1 3 3 2 1 \ / / / \ \ 3 2 1…