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| public class BestTimeToBuyAndSellStockIII {
public int maxProfit(int[] prices) {
if (prices.length < 2) {
return 0;
}
int[] before = new int[prices.length];
int[] after = new int[prices.length];
before[0] = 0;
after[prices.length - 1] = 0;
int min = prices[0];
for (int i = 1; i < prices.length; i++) {
min = Math.min(min, prices[i]);
before[i] = Math.max(before[i - 1], prices[i] - min);
}
int max = prices[prices.length - 1];
for (int i = prices.length - 2; i >= 0; i--) {
max = Math.max(max, prices[i]);
after[i] = Math.max(after[i + 1], max - prices[i]);
}
max = 0;
for (int i = 0; i < prices.length; i++) {
if (before[i] + after[i] > max) {
max = before[i] + after[i];
}
}
return max;
}
}
|