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| class Solution { public int maxProfit(int[] prices) { int n = prices.length; if (n < 2) { return 0; }
int[] dp = new int[2]; dp[0] = 0; dp[1] = -prices[0];
for (int i = 0; i < n; i++) { dp[0] = Math.max(dp[0], dp[1] + prices[i]); dp[1] = Math.max(dp[1], dp[0] - prices[i]); }
return dp[0]; } }
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