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····························~~~~~~~~~~~~~~