#include<stdio.h>
#include<math.h>
int main()
{
    int x1,y1,x2,y2,x3,y3,a,b,c;;
    while(scanf("%d %d %d %d %d %d",&x1,&y1,&x2,&y2,&x3,&y3)!=EOF)
    {
        a=sqrt((x2-x3)*(x2-x3)+(y2-y3)*(y2-y3));
        b=sqrt((x1-x3)*(x1-x3)+(y1-y3)*(y1-y3));
        c=sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
        if(a+b>c||a+c>b||b+c>a)
        {
            printf("good\n");
        }
        else
        {
            printf("sorry\n");
        }
    }
    return 0;
}
判断是否为三角形，输出的总是good，是哪错

改完之后结果输出都为sorry

a,b,c就是三边长

已经试过了，结果还是一样