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package class15;
//leetcode 123
public class Code03_BestTimeToBuyAndSellStockIII {
public static int maxProfit(int[] prices) {
if (prices == null || prices.length < 2) {
return 0;
}
int ans = 0;
int doneOnceMinusBuyMax = -prices[0];
int doneOnceMax = 0;
int min = prices[0];
for (int i = 1; i < prices.length; i++) {
min = Math.min(min, prices[i]);
ans = Math.max(ans, doneOnceMinusBuyMax + prices[i]);
doneOnceMax = Math.max(doneOnceMax, prices[i] - min);
doneOnceMinusBuyMax = Math.max(doneOnceMinusBuyMax, doneOnceMax - prices[i]);
}
return ans;
}
}