How to use compare in c++

<blockquote> <p>The compare function in C is used to compare the order of elements in the container and returns a Boolean value: true if the first element is greater than the second element, false if less than or equal to it. It requires the start and end iterators of the two containers, and a comparison function object, which uses the < operator by default, or a custom comparison function can be specified. </p></blockquote><p><img src="https://img.php.cn/upload/article/202405/01/2024050116271942696.jpg"/ alt="How to use compare in c++" ></p><p><strong>Compare usage in C</strong></p><p>The compare function is the algorithm provided in the <algorithm> header file in C , used to compare elements in containers. It compares two elements and returns a boolean value: </p> <ul> <li>true: if the first element is greater than the second element </li> <li>false: if the first element is less than or equal to the second Elements</li> </ul> <p><strong>Syntax</strong></p> <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><code class="cpp">template<class ForwardIterator, class Compare> ForwardIterator compare(ForwardIterator first1, ForwardIterator last1, ForwardIterator first2, ForwardIterator last2, Compare comp);</code></pre><div class="contentsignin">Copy after login</div></div> <p><strong>Parameters</strong></p> <ul> <li> <strong>first1, last1: </strong>Start and end iterators of the first container. </li> <li> <strong>first2, last2: </strong>The starting and ending iterators of the second container. </li> <li> <strong>comp: </strong>Comparison function object, used to compare two elements. </li> </ul> <p><strong>Comparison function object</strong></p> <p>The comparison function object is a function object that accepts two elements and returns a Boolean value indicating whether the first element is greater than The second element. By default, this comparison function uses the <code><</code> operator, but you can also specify a custom comparison function. </p><p><strong>Usage</strong></p><p>compare function compares the order of elements in two containers. It returns an iterator pointing to elements in the first container that are not equal to the corresponding elements in the second container. If the two containers are identical, returns the ending iterator of the last container. </p><p><strong>Example</strong></p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false"><code class="cpp">#include <iostream> #include <algorithm> int main() { int arr1[] = {1, 3, 5, 7, 9}; int arr2[] = {2, 4, 6, 8, 10}; // 比较 arr1 和 arr2 auto it = std::compare(std::begin(arr1), std::end(arr1), std::begin(arr2), std::end(arr2)); // 打印不相同的元素 std::cout << "第一个不相同的元素： " << *it << std::endl; return 0; }</code></p> <p>Output: </p> <pre class="brush:php;toolbar:false"><code>第一个不相同的元素： 2</code></pre><div class="contentsignin">Copy after login</div></div> </blockquote>

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