#include<stdio.h>
#include<math.h>
void sort(int arr[], int length)
{
    int __switch__;
    for (int i = 0; i < length - 1; i++)
    {
        for (int j = i + 1; j < length; j++)
        {
            if (arr[i] > arr[j])
            {
                __switch__ = arr[i];
                arr[i] = arr[j];
                arr[j] = __switch__;
            }
        }
    }
}

int main(void)
{
    int arr[3];
	scanf("%d %d %d", &arr[0], &arr[1], &arr[2]);
    sort(arr, 3);
    if (arr[0] + arr[1] < arr[2]) 
        printf("Not triangle");
	else
	{
        if (pow(arr[0], 2) + pow(arr[1], 2) == pow(arr[2], 2)) 
            printf("Right triangle\n");
        else if (pow(arr[0], 2) + pow(arr[1], 2) > pow(arr[2], 2)) 
            printf("Acute triangle\n");
        else if (pow(arr[0], 2) + pow(arr[1], 2) < pow(arr[2], 2)) 
            printf("Obtuse triangle\n");
        if (arr[0] == arr[1] || arr[0] == arr[2] || arr[1] == arr[2]) 
            printf("Isosceles triangle\n");
        if (arr[0] == arr[1] && arr[0] == arr[2] && arr[1] == arr[2]) 
            printf("Equilateral triangle\n");
	}
	return 0;
}

没通过 测试点#6 求大佬看看哪里出了问题