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@@ -0,0 +1,54 @@
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+package main
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+
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+import "fmt"
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+
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+func main() {
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+ var n int
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+
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+ n = 1
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+ fmt.Println(climbStairs(n))
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+
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+ n = 2
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+ fmt.Println(climbStairs(n))
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+
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+ n = 3
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+ fmt.Println(climbStairs(n))
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+
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+ n = 4
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+ fmt.Println(climbStairs(n))
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+
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+ n = 5
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+ fmt.Println(climbStairs(n))
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+
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+ n = 6
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+ fmt.Println(climbStairs(n))
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+}
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+
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+func climbStairs(n int) int {
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+ if n == 1 {
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+ return 1
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+ }
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+ if n == 2 {
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+ return 2
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+ }
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+ var record = map[int]int{
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+ 1: 1,
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+ 2: 2,
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+ }
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+ return climbSteps(n, 1, record) + climbSteps(n, 2, record)
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+}
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+
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+func climbSteps(n, step int, record map[int]int) int {
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+ last := n - step
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+ if last <= 0 {
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+ return 0
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+ }
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+ v, ok := record[last]
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+ if ok {
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+ return v
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+ }
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+ num1 := climbSteps(last, 1, record)
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+ num2 := climbSteps(last, 2, record)
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+ record[last] = num1 + num2
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+ return num1 + num2
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+}
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