Wolf of Wall Street 2 - 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 once. You must buy before you can sell it. Note: You are not required to buy or sell the stock. Constraints n ≤ 100,000 where n is the length of prices Example 1 Input prices = [9, 11, 8, 5, 7, 10] Output 5 Explanation You can buy at 5 and sell at 10. Example 2 Input prices = [1, 2, 3, 4, 5, 6, 7, 8, 9] Output 8 Explanation You can buy at 1 and sell at 9. Example 3 Input prices = [9, 8, 7, 6, 5, 4, 3, 2, 1] Output 0 Explanation The stock's only going down so we don't buy at all.
Solution :
Solution in C++ :
int solve(vector<int>& prices) {
int profit = 0;
int low = INT_MAX;
for (auto x : prices) {
low = min(low, x);
profit = max(profit, x - low);
}
return profit;
}
Solution in Java :
import java.util.*;
class Solution {
public int solve(int[] prices) {
int len = prices.length;
if (len == 0 || len == 1)
return 0;
int min = prices[0], diff = 0;
for (int i = 1; i < len; i++) {
if (prices[i] - min > diff) {
diff = prices[i] - min;
}
if (prices[i] < min) {
min = prices[i];
}
}
return diff;
}
}
Solution in Python :
class Solution:
def solve(self, prices):
if len(prices) < 2:
return 0
maxProfit = 0
min = prices[0]
for i in prices[1:]:
if i - min > maxProfit:
maxProfit = i - min
if i < min:
min = i
return maxProfit
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