编辑代码

//注释注释
#include<stdio.h>

int main(){
    int a,b,c,d;
    scanf("%d%d%d",&a,&b,&c);
    //sort
    if(c<a){
        d=a;
        a=c;
        c=d;
    }
    if(c<b){
        d=c;
        c=b;
        b=d;
    }
    if(a>b){
        d=b;
        b=a;
        a=d;
    }
    if(!(a+b>c)){
        printf("Not a triangle");
    }
    else if(a==c){
        printf("Equilateral triangle");
    }
    else if((a-b)*(b-c)==0){
        printf("Isosceles triangle");
    }
    else printf("Regular triangle");

	return 0;
}