买卖股票的最佳时机 about pisecespeng.record.me HOT 3 CLOSED

private static int func(int[] ints) {
    int min = Integer.MAX_VALUE, max = Integer.MIN_VALUE;
    int result = 0;
    for (int i = 0; i < ints.length; i++) {
        int v = ints[i];
        // 判定最大最小值
        if (min > v) {
            min = v;
            max = min;  // 最小值刷新时, 重制最大值
        } else if (max < v) {
            max = v;
            result = (result < (max - min)) ? (max - min) : result;  // 最大值刷新时, 重新判断最大利润
        }
    }
    return result;
}

public static int func(int prices[]) {
    int maxprofit = 0;
    for (int i = 0; i < prices.length - 1; i++) {
        for (int j = i + 1; j < prices.length; j++) {
            int profit = prices[j] - prices[i];
            if (profit > maxprofit) {
                maxprofit = profit;
            }
        }
    }
    return maxprofit;
}

public static int func(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;
}