Step through the algorithm visually — use Play or the step buttons (inspired by AlgoMaster / visualgo).
Amazon interview context: Best Time to Buy and Sell Stock is a Easy Sliding Window problem — Maintain a window [L, R] and update counts as you expand or contract.
Use the animation above to step through each move before writing code.
Pattern: Sliding Window
Read from stdin, write to stdout. Classic interview problem #121.
Best Time to Buy and Sell Stock — Amazon interview prep · Sliding Window
Classic interview problem #121.
Input (stdin)
Line 1: daily prices
Output (stdout)
Max profit
Your program must read from stdin and write the answer to stdout (no extra debug text).
7 1 5 3 6 4
5
| Test | Status | Details |
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Ready — edit the code above and click Run or Submit.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
class Program
{
static int[] Ria(string line = null)
{
line ??= Console.ReadLine();
if (string.IsNullOrWhiteSpace(line)) return Array.Empty<int>();
return line.Trim().Split(new[] { ' ', ',', '\t' }, StringSplitOptions.RemoveEmptyEntries)
.Select(int.Parse).ToArray();
}
static string[] Rsa()
{
int n = int.Parse(Console.ReadLine());
var arr = new string[n];
for (int i = 0; i < n; i++) arr[i] = Console.ReadLine();
return arr;
}
static void W(params object[] parts) => Console.WriteLine(string.Join(" ", parts));
static void Wb(bool v) => Console.WriteLine(v ? "true" : "false");
static void Wi(int v) => Console.WriteLine(v);
static void Ws(string v) => Console.WriteLine(v);
static void Main()
{
var prices = Ria();
int min = int.MaxValue, best = 0;
foreach (var p in prices) { min = Math.Min(min, p); best = Math.Max(best, p - min); }
Wi(best);
}
}Try solving on your own first, then reveal the official answer.