在向量中找到元素的索引并将其移除

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

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

    // 找到目标元素的索引
    auto it = std::find(vec.begin(), vec.end(), target);
    if (it != vec.end()) {
        int index = std::distance(vec.begin(), it);
        std::cout << "Element " << target << " found at index " << index << std::endl;

        // 移除目标元素
        vec.erase(it);
        std::cout << "Element removed. Updated vector: ";
        for (int num : vec) {
            std::cout << num << " ";
        }
        std::cout << std::endl;
    } else {
        std::cout << "Element " << target << " not found." << std::endl;
    }

    return 0;
}