#include<bits/stdc++.h> using namespace std; int main() { int a,b,c; cin>>a>>b>>c; if(a+b>c&&a+c>b&&b+c>a) { if(aa+bbcc||aa+c*cbb||bb+cc==aa) cout<<"Yes"; else cout<<"No"; } else cout<<"Not a triangle"; return 0; }

#include<bits/std\c++.h> using namespace std; int main() { double a,b,c,d,e,f; cin>>a>>b>>c; d=max(max(a,b),c); f=min(min(a,b),c); e=a+b+c-d-f; if(a+b<c&a+c<b&b+c<a) { cout<<"Not a triangle"; } else { if(d=ff+ee) { cout<<"Yes"; } else { cout<<"No"; } } return 0; }

思路

考察勾股定理。

code

#include<bits/stdc++.h>
using namespace std;
int a[4];
int main(){
	cin>>a[0]>>a[1]>>a[2];
	sort(a,a+3);
	if(a[0]+a[1]<=a[2])	puts("Not a triangle");
	else if(a[0]*a[0]+a[1]*a[1]==a[2]*a[2])	puts("Yes");
	else	puts("No");
}

#include<bits/stdc++.h> 
using namespace std; 
int main() 
{ 
 int a,b,c; 
 cin>>a>>b>>c; 
 if(a+b>c&&a+c>b&&b+c>a) 
 {
 if(aa+bb==c*c) 
  cout<<"Yes"; else cout<<"No"; 
 } 
 else 
  cout<<"Not a triangle"; 
 return 0; 
}

using namespace std;
int main()
{
	int a,b,c;
	cin>>a>>b>>c;
	if(a+b>c&&a+c>b&&b+c>a)
	{
		if(a*a+b*b==c*c||a*a+c*c==b*b||c*c+b*b==a*a)
		cout<<"Yes";
		else
		cout<<"No";
	}
	else
	cout<<"Not a triangle";
	return 0;
}

#include<bits/stdc++.h> using namespace std; int main(){ int a,b,c; cin>>a>>b>>c; if(aa+bbcc||aa+c*cbb||bb+cc==aa) cout<<"Yes"; else{ if(a+b<=c||a+c<=b||b+c<=a) cout<<"Not a triangle"; else cout<<"No"; } return 0; }

555

#include<bits/stdc++.h> using namespace std; int main() { int a,b,c; cin>>a>>b>>c; if(a+b>c&&a+c>b&&b+c>a) { if(aa+bbcc||aa+c*cbb||bb+cc==aa) cout<<"Yes"; else cout<<"No"; } else{cout<<"Not a triangle";} return 0; }

#include<bits/stdc++.h>

using namespace std; int main() {long long int a,b,c; cin>>a>>b>>c; if(a+b>c&&a+c>b&&c+b>a) {if(aa+bbcc||aa+c*cbb||cc+bb==aa) cout<<"Yes"; else cout<<"No";} else cout<<"Not a triangle"; return 0; }

#include<bits/stdc++.h> using namespace std; int main() { int a,b,c; cin>>a>>b>>c; if(a+b>c&&a+c>b&&b+c>a) { if(aa+bbcc||aa+c*cbb||bb+cc==aa) { cout<<"Yes"; } else { cout<<"No"; } } else { cout<<"Not a triangle"; } return 0; }

#include<bits/stdc++.h> using namespace std; int main() {double a,b,c; cin>>a>>b>>c; if(aa+bbcc||aa+c*cbb||bb+cc==aa) {cout<<"Yes";} else if(a+b>c&&a-b<c) {cout<<"No";} else {cout<<"Not a triangle";} return 0; }

#include<bits/stdc++.h> using namespace std; int main() { int a,b,c; cin>>a>>b>>c; if(aa+bb!=cc) { cout<<"Not a triangle"<<endl; } else if(aa+bb==cc) { cout<<"Yes"<<endl; } else { cout<<"No"<<endl; } return 0; }

#include<bits/stdc++.h> using namespace std; int main() { int a,b,c; cin>>a>>b>>c; if(a+b>c&&a+c>b&&b+c>a) {if(aa+bb==c*c) cout<<"Yes"; else cout<<"No"; } else cout<<"Not a triangle"; return 0; }