335. Self Crossing

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还记得高中的向量吗？leetcode 335. Self Crossing（判断线段相交）

传统解法题目来自 leetcode 335. Self Crossing. 题意非常简单,有一个点,一开始位于 (0, 0) 位置,然后有规律地往上,左,下,右方向移动一定的距离,判断是否会相交(self crossing). 一个很容易想到的方案就是求出所有线段,然后用 O(n^2) 的时间复杂度两两判断线段是否相交,而线段相交的判断,可以列个二元一次方程求解(交点).这个解法非常容易想到,但是实际操作起来比较复杂,接下去介绍利用向量的解法. 向量解法简单回顾下向量,具体的自行谷歌.向量就…

/* * 335. Self Crossing * 2016-7-10 by Mingyang */ // Categorize the self-crossing scenarios, there are 3 of them: // 1. Fourth line crosses first line and works for fifth line crosses second line and so on... // 2. Fifth line meets first line and wo…

【LeetCode】335. Self Crossing（python）

Problem:You are given an array x of n positive numbers. You start at point (0,0) and moves x[0] metres to the north, then x[1] metres to the west, x[2] metres to the south,x[3] metres to the east and so on. In other words, after each move your direct…

[leetcode]335. Self Crossing

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【LeetCode】Self Crossing（335）

1. Description You are given an array x of n positive numbers. You start at point (0,0) and moves x[0] metres to the north, then x[1] metres to the west, x[2] metres to the south, x[3] metres to the east and so on. In other words, after each move you…

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You are given an array x of n positive numbers. You start at point (0,0) and moves x[0] metres to the north, then x[1] metres to the west, x[2] metres to the south, x[3] metres to the east and so on. In other words, after each move your direction cha…

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Leetcode: Self Crossing

You are given an array x of n positive numbers. You start at point (0,0) and moves x[0] metres to the north, then x[1] metres to the west, x[2] metres to the south, x[3] metres to the east and so on. In other words, after each move your direction cha…

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Crossing River Time Limit: 1000MS Memory Limit: 10000K Total Submissions: 9585 Accepted: 3622 Description A group of N people wishes to go across a river with only one boat, which can at most carry two persons. Therefore some sort of shuttle arrangem…