UVA sloved: problem number: 11479 - Is this the easiest problem?

11479 - Is this the easiest problem?

A triangle is a geometric shape with three positive sides. However, any given three sides won’t necessarily form a triangle. The three sides must form a closed region. Triangles are categorized depending on the values of the sides of a valid triangle. In this problem you are required to determine the type of a triangle.
	Input
	The first line of input will contain a positive integer T<20, where T denotes the number of test cases. Each of the next T lines will contain three 32 bit signed integer.
	Output
	For each case of  input there will be one line of output. It will be formatted as: Case {x}: {triangle type}. Where x denotes the case number being processed and {triangle type} is the type of the triangle..{triangle type} will be one of the following, depending on the values of the three sides: Invalid - The three sides can not form a triangle Equilateral  - All three sides of valid triangle are equal Isosceles  - Exactly two of the sides of a valid triangle are equal. Scalene - No pair of sides are equal in a valid triangle.
	Sample Input	Sample Output
	4 1 2 5 1 1 1 4 4 2 3 4 5	Case 1: Invalid Case 2: Equilateral Case 3: Isosceles Case 4: Scalene

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