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/**
* @Title: Solution122.java——
* @Package EasyCode_02
* @Description: TODO
* @author msdumin@gmail.com
* @date 2019年4月13日 下午4:11:19
* @version V1.0
*/
package EasyCode_02;
import java.security.Principal;
/**
* @ClassName: Solution122——买卖股票的最佳时间
* @Description: TODO
* @author msdumin@gmail.com
* @date 2019年4月13日 下午4:11:19
*/
public class Solution122 {
/* //自己写的垃圾解法！！还不对
public static int maxProfit(int[] prices) {
int res = 0;
if(prices.length == 0 || prices.length == 1)
return 0;
int price_pre = prices[0];//前一天的价格
int cur_price = prices[1];//当前天的价格
if(prices.length == 2)
return cur_price - price_pre > 0 ? cur_price - price_pre : 0;
int sub = 0;
for (int i = 2; i < prices.length; i++) {
if(price_pre >= cur_price){
price_pre = cur_price;
cur_price = prices[i];
}
else{
if(prices[i] <= cur_price){
sub = cur_price - price_pre;
res += sub;
price_pre = cur_price;
cur_price = prices[i];
}else{
if(i == prices.length - 1){
sub = prices[i] - price_pre;
res += sub;
}else{
sub = cur_price - price_pre;
res += sub;
price_pre = cur_price;
cur_price = prices[i];
}
}
}
}
return res;
}*/
public static int maxProfit(int[] prices){
if(prices.length == 0 || prices.length == 1)
return 0;
int totalProfit = 0;
int onceProfit = 0;
int buyIn = prices[0];
for(int i = 1 ; i < prices.length ; i ++ ){
if(prices[i] > buyIn){
onceProfit = prices[i] - buyIn;
totalProfit += onceProfit;
onceProfit = 0;
buyIn = prices[i];
}else{
buyIn = prices[i];
}
}
return totalProfit;
}
public static void main(String[] args) {
int[] prices = {7,1,5,3,6,4};
System.out.println(maxProfit(prices));
}
}