c++ vector find函数

C++的vector类本身并没有提供find函数，但可以通过引入algorithm头文件来使用find函数。例如，可以使用以下代码来在vector中查找特定元素：

#include <iostream>
#include <vector>
#include <algorithm>

int main() {
    std::vector<int> vec = {1, 2, 3, 4, 5};

    std::vector<int>::iterator it = std::find(vec.begin(), vec.end(), 3);
    if (it != vec.end()) {
        std::cout << "元素找到了" << std::endl;
    } else {
        std::cout << "元素未找到" << std::endl;
    }

    return 0;
}

以上代码首先创建了一个包含整数的vector，然后使用find函数在vector中查找值为3的元素。如果找到了该元素，就输出"元素找到了"，否则输出"元素未找到"。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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