LeetCode-in-Go
123. Best Time to Buy and Sell Stock III
Hard
You are given an array prices where prices[i] is the price of a given stock on the ith day.
Find the maximum profit you can achieve. You may complete at most two transactions.
Note: You may not engage in multiple transactions simultaneously (i.e., you must sell the stock before you buy again).
Example 1:
Input: prices = [3,3,5,0,0,3,1,4]
Output: 6
Explanation: Buy on day 4 (price = 0) and sell on day 6 (price = 3), profit = 3-0 = 3. Then buy on day 7 (price = 1) and sell on day 8 (price = 4), profit = 4-1 = 3.
Example 2:
Input: prices = [1,2,3,4,5]
Output: 4
Explanation: Buy on day 1 (price = 1) and sell on day 5 (price = 5), profit = 5-1 = 4. Note that you cannot buy on day 1, buy on day 2 and sell them later, as you are engaging multiple transactions at the same time. You must sell before buying again.
Example 3:
Input: prices = [7,6,4,3,1]
Output: 0
Explanation: In this case, no transaction is done, i.e. max profit = 0.
Constraints:
1 <= prices.length <= 1050 <= prices[i] <= 105
Solution
func maxProfit(prices []int) int {
if len(prices) == 0 {
return 0
}
fb := -1 << 31
sb := -1 << 31
fs := 0
ss := 0
for _, price := range prices {
fb = max(fb, -price)
fs = max(fs, fb+price)
sb = max(sb, fs-price)
ss = max(ss, sb+price)
}
return ss
}
func max(a, b int) int {
if a > b {
return a
}
return b
}