思路：其实很简单可以发现相邻两个数组如果是递增的，把差值加上就是最后的结果了
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/**
* @param {number[]} prices
* @return {number}
*/
var maxProfit = function (prices) {
if (prices < 2) return 0;
let sum = 0;
for (let index = 0; index < prices.length - 1; index += 1) {
const cur = prices[index];
const next = prices[index + 1];
if (next > cur) sum += next - cur;
}
return sum;
};
console.log(maxProfit([7, 1, 5, 3, 6, 4]));
