增加新题目

动态规划/爬楼梯/main.go

@@ -0,0 +1,21 @@
+package main
+
+func main() {
+
+}
+
+func climbStairs(n int) int {
+	if n == 1 {
+		return 1
+	}
+	if n == 2 {
+		return 2
+	}
+	stepn1 := 1
+	stepn2 := 2
+	for i := 3; i <= n; i++ {
+		current := stepn1 + stepn2
+		stepn1, stepn2 = stepn2, current
+	}
+	return stepn2
+}