# Wolves of Wall Street - Amazon Top Interview Questions

### Problem Statement :

```Given a list of integers prices representing the stock prices of a company in chronological order, return the maximum profit you could have made from buying and selling that stock any number of times.

You must buy before you can sell it. But you are not required to buy or sell the stock.

Constraints

0 ≤ n ≤ 100,000 where n is the length of prices

Example 1

Input

prices = [1, 5, 3, 4, 6]

Output
7

Explanation

We can buy at 1, sell at 5, buy at 3, and sell at 6.```

### Solution :

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

int solve(vector<int>& prices) {
int profit = 0;
for(int i=0; i<prices.size(); i++){
while(prices[i] <= prices[i+1] && i+1 < prices.size())
i++;
}
return profit;
}```
```

```                        ```Solution in Java :

import java.util.*;

class Solution {
public int solve(int[] prices) {
int diff = 0;
for (int i = 0; i < prices.length - 1; i++) {
if (prices[i] < prices[i + 1])
diff = diff + prices[i + 1] - prices[i];
}
return diff;
}
}```
```

```                        ```Solution in Python :

class Solution:
def solve(self, prices):
prev_price, profit = float("inf"), 0
for p in prices:
if p > prev_price:
profit += p - prev_price
prev_price = p
return profit```
```

## Delete a Node

Delete the node at a given position in a linked list and return a reference to the head node. The head is at position 0. The list may be empty after you delete the node. In that case, return a null value. Example: list=0->1->2->3 position=2 After removing the node at position 2, list'= 0->1->-3. Function Description: Complete the deleteNode function in the editor below. deleteNo

## Print in Reverse

Given a pointer to the head of a singly-linked list, print each data value from the reversed list. If the given list is empty, do not print anything. Example head* refers to the linked list with data values 1->2->3->Null Print the following: 3 2 1 Function Description: Complete the reversePrint function in the editor below. reversePrint has the following parameters: Sing

Given the pointer to the head node of a linked list, change the next pointers of the nodes so that their order is reversed. The head pointer given may be null meaning that the initial list is empty. Example: head references the list 1->2->3->Null. Manipulate the next pointers of each node in place and return head, now referencing the head of the list 3->2->1->Null. Function Descriptio