Package g1701_1800.s1776_car_fleet_ii

Class Solution

java.lang.Object

g1701_1800.s1776_car_fleet_ii.Solution

public class Solution
extends Object

1776 - Car Fleet II.<p>Hard</p> <p>There are <code>n</code> cars traveling at different speeds in the same direction along a one-lane road. You are given an array <code>cars</code> of length <code>n</code>, where <code>cars[i] = [position_i, speed_i]</code> represents:</p> <ul> <li><code>position_i</code> is the distance between the <code>i^th</code> car and the beginning of the road in meters. It is guaranteed that <code>position_i < position_i+1</code>.</li> <li><code>speed_i</code> is the initial speed of the <code>i^th</code> car in meters per second.</li> </ul> <p>For simplicity, cars can be considered as points moving along the number line. Two cars collide when they occupy the same position. Once a car collides with another car, they unite and form a single car fleet. The cars in the formed fleet will have the same position and the same speed, which is the initial speed of the <strong>slowest</strong> car in the fleet.</p> <p>Return an array <code>answer</code>, where <code>answer[i]</code> is the time, in seconds, at which the <code>i^th</code> car collides with the next car, or <code>-1</code> if the car does not collide with the next car. Answers within <code>10^-5</code> of the actual answers are accepted.</p> <p><strong>Example 1:</strong></p> <p><strong>Input:</strong> cars = [[1,2],[2,1],[4,3],[7,2]]</p> <p><strong>Output:</strong> [1.00000,-1.00000,3.00000,-1.00000]</p> <p><strong>Explanation:</strong> After exactly one second, the first car will collide with the second car, and form a car fleet with speed 1 m/s. After exactly 3 seconds, the third car will collide with the fourth car, and form a car fleet with speed 2 m/s.</p> <p><strong>Example 2:</strong></p> <p><strong>Input:</strong> cars = [[3,4],[5,4],[6,3],[9,1]]</p> <p><strong>Output:</strong> [2.00000,1.00000,1.50000,-1.00000]</p> <p><strong>Constraints:</strong></p> <ul> <li><code>1 <= cars.length <= 10⁵</code></li> <li><code>1 <= position_i, speed_i <= 10⁶</code></li> <li><code>position_i < position_i+1</code></li> </ul>

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
double[]	getCollisionTimes(int[][] cars)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Solution

public Solution()

Method Details

getCollisionTimes

public double[] getCollisionTimes(int[][] cars)