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::GetTickCount误差18ms，所以不适合用于计算时间很短的程序，尤其是算法分析

#include 
   
    // 高精度计时器class HpTimer{public:    HpTimer()    {        QueryPerformanceFrequency(&cpuFrequency);    }    void Start()    {        QueryPerformanceCounter(&start);    }    // 秒， 乘以1000就是毫秒    double Elapse()    {        LARGE_INTEGER end;        QueryPerformanceCounter(&end);        double elaspe;        elaspe = ((double)end.QuadPart - (double)start.QuadPart) / (double)cpuFrequency.QuadPart;        return elaspe;    }private:    LARGE_INTEGER start;    LARGE_INTEGER cpuFrequency;};
   

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