Go: package main
// 三角形の形は辺の長さで決まる． 順番に３つの正整数が与えられたとき， 辺の長さがそれらの値と一致する三角形が存在するかどうかを調べ,
//  存在するなら鋭角三角形，直角三角形，鈍角三角形のいずれかを判定し， 次の入力へ進む． 三角形が存在しないとき， それまでに入力された，
// 三角形，直角三角形，鋭角三角形，鈍角三角形の 個数を空白で区切って出力し， それ以降の入力は無視して終了する
// 入力の中には必ず三角形が存在しないようなものがある と仮定してよい. 入力の行数は判らないが各行には３つの正整数が空白で区切って書かれている．
//  ただし，各整数は100 以下とする.

// return
// 三角形 直角三角形　鈍角三角形 鈍角三角形
import (
	"os"
	"fmt"
	"bufio"
)


var sc = bufio.NewScanner(os.Stdin)

func max(a, b, c int) (int, int, int) {
	if a > b {
		if b > c {
			return a, b, c
		} else {
			return c, a, b
		}
	} else {
		if b > c {
			return b, a, c
		} else {
			return c, b, a
		}
	}
}

func find_trianges(a, b, c int) string {
	a, b, c = max(a, b, c)
	r := b*b + c*c
	if a*a > r {
		return "obtuse_triangle"
	} else if a*a < r {
		return "sharped_triangle"
	} else {
		return "right_triangle"
	}
}

func main() {
	s := bufio.NewScanner(os.Stdin)
	var t, r_t, s_t, o_t int = 0, 0, 0, 0
	for s.Scan() {
		var a, b, c int
		fmt.Sscan(s.Text(), &a, &b, &c)
			a, b, c = max(a, b, c)
			if (a < b + c) {
				r := find_trianges(a, b, c)
				switch r {
				case "right_triangle":
					r_t++
				case "sharped_triangle":
					s_t++
				case "obtuse_triangle":
					o_t++
				}
				t++
			}	else {
				break
			}
			
	}
	fmt.Println(t, r_t, s_t, o_t)
}

C++: #include <vector> 
#include <list> 
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>
#include <queue>
using namespace std;

//conversion
//------------------------------------------
inline int toInt(string s) { int v; istringstream sin(s); sin >> v; return v; }
template<class T> inline string toString(T x) { ostringstream sout; sout << x; return sout.str(); }

//math
//-------------------------------------------
template<class T> inline T sqr(T x) { return x * x; }

//typedef
//------------------------------------------
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<string> VS;
typedef pair<int, int> PII;
typedef long long LL;

//container util
//------------------------------------------
#define ALL(a)  (a).begin(),(a).end()
#define RALL(a) (a).rbegin(), (a).rend()
#define PB push_back
#define MP make_pair
#define SZ(a) int((a).size())
#define EACH(i,c) for(typeof((c).begin()) i=(c).begin(); i!=(c).end(); ++i)
#define EXIST(s,e) ((s).find(e)!=(s).end())
#define SORT(c) sort((c).begin(),(c).end())

//repetition
//------------------------------------------
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n)  FOR(i,0,n)

//constant
//--------------------------------------------
const double EPS = 1e-10;
const double PI = acos(-1.0);

//clear memory
#define CLR(a) memset((a), 0 ,sizeof(a))

//debug
#define dump(x)  cerr << #x << '=' << (x) << endl;
#define debug(x) cerr << #x << '=' << (x) << '('<<'L' << __LINE__ << ')' << ' ' << __FILE__ << endl;

//
//bool is_chokaku(int a, int b, int c) {
//	return (a*a + b * b == c * c);
//}
int num_t = 0;
int num_ei = 0;
int num_don = 0;
int num_cyokaku = 0;

//最大角の大きさで三角形を決める
// 0　鋭角　1 鈍角　２　直角
double yogen(int c, int b, int a) {

	return double(b * b + c * c - a * a) / double(2 * b*c);
}

void tri(int a, int b, int c) {
	double yo = yogen(a, b, c);

	if (abs(yo) < EPS) {
		num_cyokaku++;
	}
	else if (yo < 0) {
		num_don++;
	}
	else if (yo > 0) {
		num_ei++;
	}
}
int main() {

	vector<int> a(3);
	while (true)
	{
		cin >> a[0] >> a[1] >> a[2];
		sort(ALL(a), less<int>());
		if (a[2] < a[0] + a[1]) {
			num_t++;
			tri(a[0], a[1], a[2]);
		}
		else {
			cout << num_t << " " << num_cyokaku << " " << num_ei << " " << num_don << endl;
			break;
		}
	}


}

C++: #include <iostream>
#include <string>
#include <queue>
#include <vector>
#include <set>
#include <map>
#include <algorithm>
#include <utility>
#include <iomanip>

#define ll long long int
#define pb push_back
#define mk make_pair
#define pq priority_queue

using namespace std;
typedef pair<int, int> P;
typedef pair<ll, int> Pl;
const int inf = 1e9;
const ll linf = 1LL << 50;

bool check(int a, int b, int c){
		return max(a, max(b, c)) < (a + b + c) - max(a, max(b, c));
}

int main(int argc, char const* argv[])
{
	int a, b, c;
	int tyo = 0, don = 0, ei = 0;
	while(true){
			cin >> a >> b >> c;
			if(check(a, b, c)){
					int emax = max(a, max(b, c));
					int emin = min(a, min(b, c));
					int emid = a + b + c - emax - emin;
					if(emax * emax == emin * emin + emid * emid)tyo++;
					else if(emax * emax > emin * emin + emid * emid)don++;
					else if(emax * emax < emin * emin + emid * emid)ei++;
			}else{
					cout << tyo + don + ei << " " << tyo << " " << ei << " " << don << endl;
					return 0;
			}
	}
	return 0;
}

C++: #include <cstdio>
#include <iostream>
#include <algorithm>
using namespace std;
int a,b,c,d;
int x,y,z;
int main(void){
  bool f = false;
  while(cin >> x >> y >> z){
    if(x < y) swap(x,y);
    if(x < z) swap(x,z);
    if(f || x >= y+z){
      f = true;
      continue;
    }
    a++;
    if(x*x < y*y+z*z) b++;
    else if(x*x == y*y+z*z) c++;
    else d++;
  }
  printf("%d %d %d %d",a,c,b,d);
}

C++: #include <iostream>
#include <sstream>
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <ctime>
#include <cstring>
#include <string>
#include <vector>
#include <stack>
#include <queue>
#include <deque>
#include <map>
#include <set>
#include <bitset>
#include <numeric>
#include <utility>
#include <iomanip>
#include <algorithm>
#include <functional>
using namespace std;

typedef long long ll;
typedef vector<int> vint;
typedef vector<long long> vll;
typedef pair<int,int> pint;
typedef pair<long long, long long> pll;

#define MP make_pair
#define PB push_back
#define ALL(s) (s).begin(),(s).end()
#define EACH(i, s) for (__typeof__((s).begin()) i = (s).begin(); i != (s).end(); ++i)
#define COUT(x) cout << #x << " = " << (x) << " (L" << __LINE__ << ")" << endl

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
template<class T1, class T2> ostream& operator << (ostream &s, pair<T1,T2> P) 
{ return s << '<' << P.first << ", " << P.second << '>'; }
template<class T> ostream& operator << (ostream &s, vector<T> P) 
{ for (int i = 0; i < P.size(); ++i) { if (i > 0) { s << " "; } s << P[i]; } return s; }
template<class T1, class T2> ostream& operator << (ostream &s, map<T1,T2> P) 
{ EACH(it, P) { s << "<" << it->first << "->" << it->second << "> "; } return s; }



int a[3];

int main() {
    int t = 0, just = 0, ei = 0, don = 0;
    while (cin >> a[0] >> a[1] >> a[2]) {
        sort(a, a+3);
        if (a[2] >= a[0] + a[1]) break;
        
        ++t;
        if (a[2]*a[2] == a[0]*a[0] + a[1]*a[1]) ++just;
        else if (a[2]*a[2] > a[0]*a[0] + a[1]*a[1]) ++don;
        else ++ei;
    }
    
    cout << t << " " << just << " " << ei << " " << don << endl;
    return 0;
}

C++: #include <iostream>
#include <algorithm>
 
using namespace std;
 
int a[3];
int cnt[4];
 
bool calc(){
  for(int i=0;i<3;i++){
    if(a[i] + a[(i+1)%3] <= a[(i+2)%3]) return false;
  }
  cnt[0]++;
  if(a[0] * a[0] + a[1] * a[1] == a[2] * a[2]) cnt[1]++;
  if(a[0] * a[0] + a[1] * a[1] > a[2] * a[2]) cnt[2]++;
  if(a[0] * a[0] + a[1] * a[1] < a[2] * a[2]) cnt[3]++;
  return true;
}
 
main(){
  fill(cnt, cnt+4, 0);
  bool f = true;
  while(cin >> a[0] >> a[1] >> a[2]){
    sort(a, a+3);
    if(f){
      if(!calc()) f = false;
    }
  }
  for(int i=0;i<4;i++){
    if(i) cout << ' ';
    cout << cnt[i];
  }
  cout << endl;
}