deploy: 424dc09

Author: acbin

en/lc/17/index.html

@@ -22160,9 +22160,9 @@
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-  <a href="#solution-1" class="md-nav__link">
+  <a href="#solution-1-prefix-sum" class="md-nav__link">
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-      Solution 1
+      Solution 1: Prefix Sum
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@@ -77186,7 +77186,16 @@ <h2 id="description">Description</h2>
 <h2 id="solutions">Solutions</h2>
 <!-- solution:start -->
 
-<h3 id="solution-1">Solution 1</h3>
+<h3 id="solution-1-prefix-sum">Solution 1: Prefix Sum</h3>
+<p>We define a variable $left$ to represent the sum of elements to the left of index $i$ in the array $\textit{nums}$, and a variable $right$ to represent the sum of elements to the right of index $i$ in the array $\textit{nums}$. Initially, $left = 0$, $right = \sum_{i = 0}^{n - 1} nums[i]$.</p>
+<p>We traverse the array $\textit{nums}$. For the current number $x$ being traversed, we update $right = right - x$. At this point, if $left = right$, it indicates that the current index $i$ is the middle position, and we can return it directly. Otherwise, we update $left = left + x$ and continue to traverse the next number.</p>
+<p>If the middle position is not found by the end of the traversal, return $-1$.</p>
+<p>The time complexity is $O(n)$, and the space complexity is $O(1)$. Here, $n$ is the length of the array $\textit{nums}$.</p>
+<p>Similar Problems:</p>
+<ul>
+<li><a href="https://github.com/doocs/leetcode/blob/main/solution/1900-1999/1991.Find%20the%20Middle%20Index%20in%20Array/README_EN.md">1991. Find the Middle Index in Array</a></li>
+<li><a href="https://github.com/doocs/leetcode/blob/main/solution/2500-2599/2574.Left%20and%20Right%20Sum%20Differences/README_EN.md">2574. Left and Right Sum Differences</a></li>
+</ul>
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