include <opencv2/opencv.hpp>

include <iostream>

include <cassert>

include <cmath>

include <fstream>

using namespace std;
using namespace cv;

C++程序，使用了opencv，上面是头文件和命名空间，程序里有vector，为啥不报错，能正常编译运行？

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并没有存在。。

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你用的是cv::vector，而不是std::vector

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opencv里是应该有类似这样的代码

include <vector>

namespace cv {
using std::vector;
}

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因为OpenCV有cv::vector…