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Say you have an array for which the ith  element is the price of a given stock on day i. If you were only permitted to complete at most one transaction (ie, buy one and sell one share of the stock), design an algorithm to find the maximum profit. Example 1: Input: [7, 1, 5, 3, 6, 4]Output: 5max. difference = 6-1 = 5 (not 7-1 = 6, as selling price needs to be larger than buying price)

Example 2: Input: [7, 6, 4, 3, 1]Output: 0In this case, no transaction is done, i.e. max profit = 0.

Hide Company Tags  Amazon Microsoft Bloomberg Uber Facebook Hide Tags  Array Dynamic Programming Hide Similar Problems  (M) Maximum Subarray (M) Best Time to Buy and Sell Stock II (H) Best Time to Buy and Sell Stock III (H) Best Time to Buy and Sell Stock IV(M) Best Time to Buy and Sell Stock with Cooldown

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 public int maxProfit(int[] prices) {
        if (prices.length == 0) {
            return 0;
        }
        
        int max = 0;
        int sofarMin =  prices[0];
        
        for (int i = 0; i < prices.length; i++) {
            if (prices[i] > sofarMin ) {
                max = Math.max(max, prices[i] - sofarMin); 
            } else {
                sofarMin = prices[i];
            }
        }
        return max;
    }