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<p>You are climbing a staircase. It takes <code>n</code> steps to reach the top.</p>
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<p>Each time you can either climb <code>1</code> or <code>2</code> steps. In how many distinct ways can you climb to the top?</p>
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<p> </p>
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<p><strong>Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> n = 2
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<strong>Output:</strong> 2
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<strong>Explanation:</strong> There are two ways to climb to the top.
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1. 1 step + 1 step
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2. 2 steps
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</pre>
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<p><strong>Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> n = 3
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<strong>Output:</strong> 3
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<strong>Explanation:</strong> There are three ways to climb to the top.
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1. 1 step + 1 step + 1 step
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2. 1 step + 2 steps
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3. 2 steps + 1 step
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</pre>
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<p> </p>
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<p><strong>Constraints:</strong></p>
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<ul>
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<li><code>1 <= n <= 45</code></li>
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</ul>
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