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ADD Best-Time-To-Buy-And-Sell-Stock-With-Cooldown problem #69

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	`1`	`+using System;`
	`2`	`+`
	`3`	`+public class Solution`
	`4`	`+{`
	`5`	`+ public static int MaxProfit(int[] prices)`
	`6`	`+ {`
	`7`	`+ int soldProfit = 0; // Profit when stock is sold today`
	`8`	`+ int restProfit = 0; // Profit when we do nothing today`
	`9`	`+ int holdProfit = int.MinValue; // Profit when we hold stock today`
	`10`	`+`
	`11`	`+ for (int i = 0; i < prices.Length; i++)`
	`12`	`+ {`
	`13`	`+ int previousSoldProfit = soldProfit; // Store previous day's sold profit`
	`14`	`+ soldProfit = holdProfit + prices[i]; // Update sold profit by selling stock today`
	`15`	`+ holdProfit = Math.Max(holdProfit, restProfit - prices[i]); // Update hold profit`
	`16`	`+ restProfit = Math.Max(restProfit, previousSoldProfit); // Update rest profit`
	`17`	`+ }`
	`18`	`+`
	`19`	`+ return Math.Max(soldProfit, restProfit); // Return the maximum profit possible`
	`20`	`+ }`
	`21`	`+`
	`22`	`+ public static void Main(string[] args)`
	`23`	`+ {`
	`24`	`+ int[] prices = { 1, 2, 3, 0, 2 };`
	`25`	`+`
	`26`	`+ Console.WriteLine(MaxProfit(prices));`
	`27`	`+`
	`28`	`+ Console.ReadKey();`
	`29`	`+ }`
	`30`	`+}`
	`31`	`+`

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