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- #include <iostream>
- using namespace std;
- bool tr(int a,int b,int c)
- {
- return ((a+b>c)&&(a+c>b)&&(b+c>a));
- }
- bool seg(int a,int b,int c)
- {
- return ((a==b+c)||(b==a+c)||(c==a+b));
- }
- int main()
- {
- bool normal=false;
- bool deg=false;
- int a,b,c,d;
- cin>>a>>b>>c>>d;
- normal=normal||(tr(a,b,c));
- normal=normal||(tr(a,b,d));
- normal=normal||(tr(a,c,d));
- normal=normal||(tr(b,c,d));
- deg=deg||(seg(a,b,c));
- deg=deg||(seg(a,b,d));
- deg=deg||(seg(a,c,d));
- deg=deg||(seg(b,c,d));
- if(normal)
- cout<<"TRIANGLE"<<endl;
- else if(deg)
- cout<<"SEGMENT"<<endl;
- else
- cout<<"IMPOSSIBLE"<<endl;
- return 0;
- }
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