import java.util.*;
public class Solution {
/**
*
* @param prices int整型一维数组
* @return int整型
*/
public int maxProfit (int[] prices) {
// write code here
int res = 0;
int min = prices[0];
int max = prices[0];
int min_index = 0;
int max_index = 0;
for(int i=1;i<prices.length;i++){
if(prices[i]>max&&i>min_index){
max=prices[i];
max_index = i;
int temp = max - min;
if(temp>res){
res=temp;
}
}
if(prices[i]<min){
min = prices[i];
min_index = i;
max = min;
max_index=i;
}
}
return res;
}
} 


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