杭电2039三角形

题目链接：http://acm.hdu.edu.cn/showproblem.php?pid=2039

这道题提交了五次才AC，可见我的数学功底太差啦！

#include <cstdlib>

#include <iostream>



using namespace std;



int main(int argc, char *argv[])

{

    int m;

    cin>>m;

    while(m--)

    {

      double a,b,c;

      cin>>a>>b>>c;

      if(a+b>c&&a+c>b&&b+c>a)

        cout<<"YES"<<endl;                                    

      else

        cout<<"NO"<<endl;

    }

    system("PAUSE");

    return EXIT_SUCCESS;

}

两边之和大于第三边，两边之差小于第三边！无语····························~~~~~~~~~~~~~~