There are n cars going to the same destination along a one-lane road. The destination is target miles away.
You are given two integer array position and speed, both of length n, where position[i] is the position of the ith car and speed[i] is the speed of the ith car (in miles per hour).
A car can never pass another car ahead of it, but it can catch up to it and drive bumper to bumper at the same speed. The faster car will slow down to match the slower car's speed. The distance between these two cars is ignored (i.e., they are assumed to have the same position).
\n\nA car fleet is some non-empty set of cars driving at the same position and same speed. Note that a single car is also a car fleet.
\n\nIf a car catches up to a car fleet right at the destination point, it will still be considered as one car fleet.
\n\nReturn the number of car fleets that will arrive at the destination.
\n\n\n
Example 1:
\n\n\nInput: target = 12, position = [10,8,0,5,3], speed = [2,4,1,1,3]\nOutput: 3\nExplanation:\nThe cars starting at 10 (speed 2) and 8 (speed 4) become a fleet, meeting each other at 12.\nThe car starting at 0 does not catch up to any other car, so it is a fleet by itself.\nThe cars starting at 5 (speed 1) and 3 (speed 3) become a fleet, meeting each other at 6. The fleet moves at speed 1 until it reaches target.\nNote that no other cars meet these fleets before the destination, so the answer is 3.\n\n\n
Example 2:
\n\n\nInput: target = 10, position = [3], speed = [3]\nOutput: 1\nExplanation: There is only one car, hence there is only one fleet.\n\n\n
Example 3:
\n\n\nInput: target = 100, position = [0,2,4], speed = [4,2,1]\nOutput: 1\nExplanation:\nThe cars starting at 0 (speed 4) and 2 (speed 2) become a fleet, meeting each other at 4. The fleet moves at speed 2.\nThen, the fleet (speed 2) and the car starting at 4 (speed 1) become one fleet, meeting each other at 6. The fleet moves at speed 1 until it reaches target.\n\n\n
\n
Constraints:
\n\nn == position.length == speed.length1 <= n <= 1050 < target <= 1060 <= position[i] < targetposition are unique.0 < speed[i] <= 106在一条单行道上，有 n 辆车开往同一目的地。目的地是几英里以外的 target 。
给定两个整数数组 position 和 speed ，长度都是 n ，其中 position[i] 是第 i 辆车的位置， speed[i] 是第 i 辆车的速度(单位是英里/小时)。
一辆车永远不会超过前面的另一辆车，但它可以追上去，并与前车 以相同的速度 紧接着行驶。此时，我们会忽略这两辆车之间的距离，也就是说，它们被假定处于相同的位置。
\n\n车队 是一些由行驶在相同位置、具有相同速度的车组成的非空集合。注意，一辆车也可以是一个车队。
\n\n即便一辆车在目的地才赶上了一个车队，它们仍然会被视作是同一个车队。
\n\n返回到达目的地的 车队数量 。
\n\n\n\n
示例 1：
\n\n\n输入：target = 12, position = [10,8,0,5,3], speed = [2,4,1,1,3]\n输出：3\n解释：\n从 10 和 8 开始的车会组成一个车队，它们在 12 处相遇。\n从 0 处开始的车无法追上其它车，所以它自己就是一个车队。\n从 5 和 3 开始的车会组成一个车队，它们在 6 处相遇。\n请注意，在到达目的地之前没有其它车会遇到这些车队，所以答案是 3。\n\n\n
示例 2:
\n\n\n输入: target = 10, position = [3], speed = [3]\n输出: 1\n解释: 只有一辆车，因此只有一个车队。\n\n\n
示例 3:
\n\n\n输入: target = 100, position = [0,2,4], speed = [4,2,1]\n输出: 1\n解释:\n以0(速度4)和2(速度2)出发的车辆组成车队，在4点相遇。舰队以2的速度前进。\n然后，车队(速度2)和以4(速度1)出发的汽车组成一个车队，在6点相遇。舰队以1的速度前进，直到到达目标。\n\n
\n\n
提示：
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collections<\\/a>\\u3002\\u5982\\u679c\\u60a8\\u9700\\u8981\\u4f7f\\u7528\\u5176\\u4ed6\\u5e93\\u51fd\\u6570\\uff0c\\u8bf7\\u81ea\\u884c\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u6ce8\\u610f Python 2.7 \\u5c06\\u57282020\\u5e74\\u540e\\u4e0d\\u518d\\u7ef4\\u62a4<\\/a>\\u3002 \\u5982\\u60f3\\u4f7f\\u7528\\u6700\\u65b0\\u7248\\u7684Python\\uff0c\\u8bf7\\u9009\\u62e9Python 3\\u3002<\\/p>\"],\"c\":[\"C\",\" \\u7248\\u672c\\uff1a \\u7f16\\u8bd1\\u65f6\\uff0c\\u5c06\\u4f1a\\u91c7\\u7528 \\u4e3a\\u4e86\\u4f7f\\u7528\\u65b9\\u4fbf\\uff0c\\u5927\\u90e8\\u5206\\u6807\\u51c6\\u5e93\\u7684\\u5934\\u6587\\u4ef6\\u5df2\\u7ecf\\u88ab\\u81ea\\u52a8\\u5bfc\\u5165\\u3002<\\/p>\\r\\n\\r\\n \\u5982\\u60f3\\u4f7f\\u7528\\u54c8\\u5e0c\\u8868\\u8fd0\\u7b97, \\u60a8\\u53ef\\u4ee5\\u4f7f\\u7528 uthash<\\/a>\\u3002 \\\"uthash.h\\\"\\u5df2\\u7ecf\\u9ed8\\u8ba4\\u88ab\\u5bfc\\u5165\\u3002\\u8bf7\\u770b\\u5982\\u4e0b\\u793a\\u4f8b:<\\/p>\\r\\n\\r\\n 1. 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