leetcode-go/medium/309.best-time-to-buy-and-sell-stock-with-cooldown.go

func maxProfit(prices []int) int {
	//          v-.
	//        >s0_|rest
	//       /  \
	//  rest/    \ buy
	//     / sell v
	//    s2<-----s1<.
	//             |_|rest
	//
	n := len(prices)
	if n <= 1 {
		return 0
	}
	s0, s1, s2 := 0, -prices[0], -1<<32
	for i := 1; i < n; i++ {
		s0, s1, s2 = maxInt(s0, s2), maxInt(s0-prices[i], s1), s1+prices[i]
	}
	return maxInt(s0, s2)
}

func maxInt(x, y int) int {
	if x < y {
		return y
	}
	return x
}