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20 lines
399 B
Markdown
20 lines
399 B
Markdown
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dp里求排列，1 2 步 和 2 1 步都是上三个台阶，但不一样！
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这是求排列
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```
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class Solution {
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public:
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int climbStairs(int n) {
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vector<int> dp(n + 1, 0);
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dp[0] = 1;
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for (int i = 1; i <= n; i++) {
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for (int j = 1; j <= 2; j++) {
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if (i - j >= 0) dp[i] += dp[i - j];
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}
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}
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return dp[n];
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}
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};
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```
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