leetcode 买卖股票最佳时机l l

[rookiepan]

leetCode中买卖股票的最佳时机 l l答案是这样的：

class Solution {

public int maxProfit(int[] prices) {

if(0==prices.length||null==prices) return 0;
int minPrice = prices[0];
int sumProfit = 0;
for(int i=1;i<prices.length;i++){
if(minPrice<prices[i]){
sumProfit += prices[i] - minPrice;
minPrice = prices[i];
}else{
minPrice = prices[i];
}
}
return sumProfit;
}
}
其中下面两段代码间是不是应该加个i++？为什么股票卖出后，又把当天设为最小标准了？
sumProfit += prices[i] - minPrice;
minPrice = prices[i];