# 1094. Car Pooling

You are driving a vehicle that has `capacity`

empty seats initially available for passengers. The vehicle **only** drives east (ie. it **cannot** turn around and drive west.)

Given a list of `trips`

, `trip[i] = [num_passengers, start_location, end_location]`

contains information about the `i`

-th trip: the number of passengers that must be picked up, and the locations to pick them up and drop them off. The locations are given as the number of kilometers due east from your vehicle’s initial location.

Return `true`

if and only if it is possible to pick up and drop off all passengers for all the given trips.

**Example 1:**

**Input: **

trips = [[2,1,5],[3,3,7]], capacity = 4

**Output: **

```
false
```

**Example 2:**

**Input: **

trips = [[2,1,5],[3,3,7]], capacity = 5

**Output: **

```
true
```

**Example 3:**

**Input: **

trips = [[2,1,5],[3,5,7]], capacity = 3

**Output: **

```
true
```

**Example 4:**

**Input: **

trips = [[3,2,7],[3,7,9],[8,3,9]], capacity = 11

**Output:**

#### true

#### Accepted Solution in wrong PHP syntax (don’t drink and code)

<?php class Solution { public $dic=[]; /** * @param Integer[][] $trips * @param Integer $capacity * @return Boolean */ function carPooling($trips, $capacity) { $max = 0; $sum = 0; $this->$dic = []; foreach ($trips as $c){ if(!isset($this->$dic[$c[1]])){ $this->$dic[$c[1]] = 0; } $this->$dic[$c[1]] += $c[0]; $this->$dic[$c[2]] -= $c[0]; } // ksort($this->$dic); // Calculate least expected capacity foreach($this->$dic as $d){ $sum += $d; if($sum > $max){ $max = $sum; } } return $max <= $capacity; } } ?>

#### And Here’s the solution in my mind..

<?php class Solution { public $dic=[]; /** * @param Integer[][] $trips * @param Integer $capacity * @return Boolean */ function carPooling($trips, $capacity) { $max = 0; $sum = 0; $this->dic = []; foreach ($trips as $c){ if(!isset($this->dic[$c[1]])){ $this->dic[$c[1]] = 0; } $this->dic[$c[1]] += $c[0]; $this->dic[$c[2]] -= $c[0]; } ksort($this->dic); // I'm finding the min capacity here, but it's not necessary foreach($this->dic as $d){ $sum += $d; if($sum > $max){ $max = $sum; } } return $max <= $capacity; } } ?>

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