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| // @Title: 买卖股票的最佳时机 IV (Best Time to Buy and Sell Stock IV)
// @Author: 15816537946@163.com
// @Date: 2020-12-28 23:46:46
// @Runtime: 8 ms
// @Memory: 4.7 MB
func maxProfit(k int, prices []int) int {
n := len(prices)
if n == 0 {
return 0
}
k = min(k, n/2)
buy := make([][]int, n)
sell := make([][]int, n)
for i := range buy {
buy[i] = make([]int, k+1)
sell[i] = make([]int, k+1)
}
buy[0][0] = -prices[0]
for i := 1; i <= k; i++ {
buy[0][i] = math.MinInt64 / 2
sell[0][i] = math.MinInt64 / 2
}
for i := 1; i < n; i++ {
buy[i][0] = max(buy[i-1][0], sell[i-1][0]-prices[i])
for j := 1; j <= k; j++ {
buy[i][j] = max(buy[i-1][j], sell[i-1][j]-prices[i])
sell[i][j] = max(sell[i-1][j], buy[i-1][j-1]+prices[i])
}
}
return max(sell[n-1]...)
}
func min(a, b int) int {
if a < b {
return a
}
return b
}
func max(a ...int) int {
res := a[0]
for _, v := range a[1:] {
if v > res {
res = v
}
}
return res
}
|