Problem Statement: Given an array of prices of stocks on different days, Need to find which days are the best for buying and selling the stocks.

funciton bestTimeToSellAndBuyCost(arr){}


const arr = [7,1,5,3,6,4]
bestTimeToSellAndBuyCost(arr)

This problem can be solved by looping

• the array by taking two variables one is min(To find out the min element) which is initially assigned to the first element(arr[0]) of the array and the second variable will be profit which is initially assigned to 0

• Initialize cost variable and assign min - arr[i]

• Take the max value from profit and cost and assign it to profit

• Compare min and arr[i]and assign min value to min

function bestTimeToSellAndBuyCost(arr) {
  let min = arr[0];
  let profit = 0;

  for (let i = 1; i < arr.length; i++) {
    const cost = arr[i] - min;
    profit = Math.max(profit, cost);
    min = Math.min(arr[i], min);
  }

  return profit;
}

Thank you and have a great day :)