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求问题与解法

#include<bits/stdc++.h>
using namespace std;
int main(){
	int a[3];
	cin>>a[0]>>a[1]>>a[2];
	sort(a,a+3);
	if(a[0]+a[1]<a[2]){
		cout<<"Not triangle";
		return 0;
	}
	if((a[0]+a[1])*(a[0]+a[1])==a[2]){
		cout<<"Right triangle\n";
	}
	if((a[0]+a[1])*(a[0]+a[1])>a[2]){
		cout<<"Acute triangle\n";
	}
	if((a[0]+a[1])*(a[0]+a[1])<a[2]){
		cout<<"Obtuse triangle\n";
	}
	if(a[0]==a[1]||a[1]==a[2]||a[2]==a[0]){
		cout<<"Isosceles triangle\n";
	}
	if(a[0]==a[2]==a[1]){
		cout<<"Equilateral triangle\n";
	}
}