#184Medium#39 in PayPal's list· asked at 24 companies
Climbing stairs
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What we know
Example 1
Input: n = 2 Output: 2
1 + 1 or 2.
Example 2
Input: n = 3 Output: 3
1+1+1, 1+2, 2+1.
Constraints
- •
1 <= n <= 45 - •
The answer fits in a 32-bit signed integer.