# Uber Pool - Amazon Top Interview Questions

### Problem Statement :

```You are given a two-dimensional integer list requested_trips containing [start_x, end_x, num_passengers], and an integer capacity. Each requested trip asks to pick up num_passengers passenger at start_x and drop them off at end_x. You also have a car with the given capacity, and start at x = 0.

Given that you'd like to pick up every passenger and can only move right, return whether you can pick up and drop off everyone.

Constraints

n ≤ 100,000 where n is the length of requested_trips

Example 1

Input

trips = [
[1, 30, 2],
[3, 5, 3],
[5, 9, 3]
]

capacity = 6

Output

True```

### Solution :

```                        ```Solution in C++ :

bool solve(vector<vector<int>>& trips, int capacity) {
vector<pair<int, int>> helper;
for (auto& v : trips) {
helper.emplace_back(v[0], v[2]);
helper.emplace_back(v[1], -v[2]);
}
sort(helper.begin(), helper.end());

for (auto& p : helper) {
capacity -= p.second;
if (capacity < 0) return false;
}
return true;
}```
```

```                        ```Solution in Python :

class Solution:
def solve(self, trips, capacity):
events = [0] * (max([_[1] for _ in trips]) + 1)
# print(len(events))
for start, end, passengers in trips:
events[start] += passengers
events[end] += -passengers

# print(events)
curr_capacity = 0

for event in events:
curr_capacity += event
if curr_capacity > capacity:
return False
return True```
```

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