70. 爬楼梯(Easy)

Go 示例

func climbStairs(n int) int {
    if n == 0 || n == 1{
        return n
    }
    dp := make([]int, n + 1)
    dp[0] = 1
    dp[1] = 1
    for i := 2; i < n + 1; i++ {
        dp[i] = dp[i - 1] + dp[i - 2]
    }
    return dp[n]
}