Is this the easiest problem

#include<stdio.h>
int main()
{
    long long int t,a,b,c,i;
    scanf("%lld",&t);
    for(i=1; i<=t; i++)
    {
        scanf("%lld%lld%lld",&a,&b,&c);
        if((a+b)<=c || (b+c)<=a || (c+a)<=b)
        {
            printf("Case %lld: Invalid\n",i);
        }
        else if(a<=0 || b<=0 || c<=0)
        {
            printf("Case %lld: Invalid\n",i);
        }
        else if(a==b && b==c)
        {
            printf("Case %lld: Equilateral\n",i);
        }
        else if(a==b||b==c||c==a)
        {
            printf("Case %lld: Isosceles\n",i);
        }
        else
        {
            printf("Case %lld: Scalene\n",i);
        }
    }
    return 0;
}