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122. Tempus optimum emere et vendere business days II

Datur integer ornatus prices ubiprices[i] pretium datum est de stirpei^th illo die.

Singulis diebus statuas emere et/vel stirpem vendere. Tantum tenere potesad summum unum generis partem aliquando. Sed emere potes eam tunc statim vendereEodem quoque die.

Find et reditus the maximum prodest consequi potes.

Exemplum 1:

**Input:** prices = [7,1,5,3,6,4]
**Output:** 7
**Explanation:** Buy on day 2 (price = 1) and sell on day 3 (price = 5), profit = 5-1 = 4.
Then buy on day 4 (price = 3) and sell on day 5 (price = 6), profit = 6-3 = 3.
Total profit is 4 + 3 = 7.
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Exemplum II:

**Input:** prices = [1,2,3,4,5]
**Output:** 4
**Explanation:** Buy on day 1 (price = 1) and sell on day 5 (price = 5), profit = 5-1 = 4.
Total profit is 4.
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Exemplum III:

**Input:** prices = [7,6,4,3,1]
**Output:** 0
**Explanation:** There is no way to make a positive profit, so we never buy the stock to achieve the maximum profit of 0.
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Coactus:

• 1 <= prices.length <= 3 * 10^4
• 0 <= prices[i] <= 10^4

Idea

* DSF
* DP
* Greedy
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/**
 * @param {number[]} prices
 * @return {number}
 */
var maxProfit = function(prices) {
    let res = 0;
    for(let i = 1; i < prices.length; i++){
        if(prices[i-1] < prices[i]){ // 将每天的收益看作自己的收益
            res += prices[i] - prices[i-1]
        }
    }
    return res;
};
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