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Problem121.java

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class Problem121 {

public static void main(String[] args) {

Problem121 p = new Problem121();

int[] nums = {1,4,2};

System.out.println(p.maxProfit(nums));

}

public int maxProfit1(int[] prices) {

int max = Integer.MIN_VALUE;

for (int i = prices.length-1; i > 0; i--) {

for (int j = i-1; j >= 0; j--) {

int profit = prices[i]-prices[j];

max = profit > max ? profit: max;

}

}

return max;

}

public int maxProfit(int[] prices) {

int minprice = Integer.MAX_VALUE;

int maxprofit = 0;

for (int i = 0; i < prices.length; i++) {

if (prices[i] < minprice)

minprice = prices[i];

else if (prices[i] - minprice > maxprofit)

maxprofit = prices[i] - minprice;

}

return maxprofit;

}

}