2023-12-09 18:42:21 +08:00
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<p>请你编写一个函数，它接收一个函数数组 <code>[f<sub>1</sub>, f<sub>2</sub>, f<sub>3</sub>，…， f<sub>n</sub>]</code> ，并返回一个新的函数 <code>fn</code> ，它是函数数组的 <strong>复合函数</strong> 。</p>
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2023-04-23 22:41:08 +08:00
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<p><code>[f(x)， g(x)， h(x)]</code> 的 <strong>复合函数</strong> 为 <code>fn(x) = f(g(h(x)))</code> 。</p>
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<p>一个空函数列表的 <strong>复合函数</strong> 是 <strong>恒等函数</strong> <code>f(x) = x</code> 。</p>
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<p>你可以假设数组中的每个函数接受一个整型参数作为输入，并返回一个整型作为输出。</p>
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<p> </p>
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<p><strong class="example">示例 1：</strong></p>
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<pre>
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<strong>输入：</strong>functions = [x => x + 1, x => x * x, x => 2 * x], x = 4
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<b>输出：</b>65
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<strong>解释：</strong>
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从右向左计算......
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Starting with x = 4.
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2 * (4) = 8
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(8) * (8) = 64
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(64) + 1 = 65
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</pre>
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<p><strong class="example">示例 2：</strong></p>
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<pre>
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<b>输出：</b>functions = [x => 10 * x, x => 10 * x, x => 10 * x], x = 1
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<b>输入：</b>1000
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<strong>解释：</strong>
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从右向左计算......
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10 * (1) = 10
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10 * (10) = 100
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10 * (100) = 1000
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</pre>
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<p><strong class="example">示例 3：</strong></p>
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<pre>
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<b>输入：</b>functions = [], x = 42
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<b>输出：</b>42
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<strong>解释：</strong>
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空函数列表的复合函数就是恒等函数</pre>
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<p> </p>
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<p><strong>提示：</strong></p>
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<ul>
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<li><code><font face="monospace">-1000 <= x <= 1000</font></code></li>
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<li><code><font face="monospace">0 <= functions.length <= 1000</font></code></li>
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2023-12-09 18:42:21 +08:00
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<li><font face="monospace">所有函数都接受并返回一个整型</font></li>
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2023-04-23 22:41:08 +08:00
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</ul>
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