求助大神，不仅报错还有RE

#include <stdio.h>

int main()
{
    int a,b,c;
    int A,B,C;
    A=(b*b+c*c-a*a)/(2*b*c);
    B=(a*a+c*c-b*b)/(2*a*c);
    C=(b*b+a*a-c*c)/(2*b*a);
    scanf("%d %d %d",&a,&b,&c);
    if ( a+b<=c||a+c<=b||b+c<=a ){
        printf("Not triangle");
    }else{
        if ( a*a+b*b==c*c||a*a+c*c==b*b||b*b+c*c==a*a ){
            printf("Right triangle");
        }else if ( A>0&&B>0&&C>0 ){
            printf("Acute triangle");
        }else if ( A<0||B<0||C<0 ){
            printf("Obtuse triangle");
        }
    }
    if ( (a==b&&a!=c)||(a==c&&a!=b)||(b==c&&b!=a) ){
        printf("Isosceles triangle");
    }else if ( a==b&&a==c&&b==c ){
        printf("Equilateral triangle");
    }
    
    return 0;
}
感觉没大问题啊