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- class Solution {
- public int climbStairs(int n) {
- if (n < 0) return 0;
- int a = 1;
- int b = 1;
- int t;
- for (int i = 1; i < n; i++) {
- t = b;
- b += a;
- a = t;
- }
- return b;
- }
- }
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