[Vssue]0070.爬楼梯.md

[youngyangyang04]

https://www.programmercarl.com/0070.%E7%88%AC%E6%A5%BC%E6%A2%AF.html

[Du1in9]

int[] dp = new int[n + 1];
dp[0] = 1;
dp[1] = 1;
for (int i = 2; i < n + 1; i++) {
    dp[i] = dp[i - 1] + dp[i - 2];
}
return dp[n];

// 例: n = 5, dp = [1,1,0,0,0,0]
i = 2: dp = [1,1,2,0,0,0]
i = 3: dp = [1,1,2,3,0,0]
i = 4: dp = [1,1,2,3,5,0]
i = 5: dp = [1,1,2,3,5,8]

[JIE-yx]

所以如果面试的时候，被问到dp[0]为什么初始化为1，应该怎么解释呢？从答案倒退初始化的值？