BestTimeToBuyAndSellStock
BestTimeToBuyAndSellStock.java 源码
package algorithm.greedy;
/**
* @author roseduan
* @time 2019/7/14 9:34
* @description 买卖股票的最佳时机
* leetcode第121题：https://leetcode-cn.com/problems/best-time-to-buy-and-sell-stock/
*/
public class BestTimeToBuyAndSellStock {
/**
* 暴力查找
*/
private static int maxProfit1(int[] prices) {
int length = prices.length;
int res = 0;
for (int i = 0; i < length - 1; i++) {
for (int j = i + 1; j < length; j++) {
int profit = prices[j] - prices[i];
if (profit > res){
res = profit;
}
}
}
return res;
}
/**
* 一次遍历
*/
private static int maxProfit2(int[] prices){
int min = Integer.MAX_VALUE;
int res = 0;
for (int price : prices) {
if (min > price) {
min = price;
} else if (price - min > res) {
res = price - min;
}
}
return res;
}
}
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