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2023-08-28 23:52:27 +08:00
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@@ -4191,7 +4191,7 @@ T(n) = 3 + 2n
<ol>
<li><strong>忽略 <span class="arithmatex">\(T(n)\)</span> 中的常数项</strong>。因为它们都与 <span class="arithmatex">\(n\)</span> 无关，所以对时间复杂度不产生影响。</li>
<li><strong>省略所有系数</strong>。例如，循环 <span class="arithmatex">\(2n\)</span> 次、<span class="arithmatex">\(5n + 1\)</span> 次等，都可以简化记为 <span class="arithmatex">\(n\)</span> 次，因为 <span class="arithmatex">\(n\)</span> 前面的系数对时间复杂度没有影响。</li>
<li><strong>循环嵌套时使用乘法</strong>。总操作数量等于外层循环和内层循环操作数量之积，每一层循环依然可以分别套用第 <code>1.</code> 点和第 <code>2.</code> 点的技巧。、</li>
<li><strong>循环嵌套时使用乘法</strong>。总操作数量等于外层循环和内层循环操作数量之积，每一层循环依然可以分别套用第 <code>1.</code> 点和第 <code>2.</code> 点的技巧。</li>
</ol>
<p>给定一个函数，我们可以用上述技巧来统计操作数量。</p>
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