Go: package main

import (
	"fmt"
	"sort"
)

// TriangleKind kind of triangle
type TriangleKind int

const (
	// Nothing not triangle
	Nothing TriangleKind = iota
	// RightTriangle the right triangle
	RightTriangle
	// SharpTriangle the sharp triangle
	SharpTriangle
	// ObtuseTriangle the obtuse triangle
	ObtuseTriangle
) // const for Triangle kind

type result struct {
	rTriangle int
	sTriangle int
	oTriangle int
}

func (res *result) String() string {
	return fmt.Sprintf("%d %d %d %d", res.rTriangle+res.sTriangle+res.oTriangle, res.rTriangle, res.sTriangle, res.oTriangle)
}

func checkTriangleType(a int, b int, c int) TriangleKind {
	p := []int{a, b, c}
	sort.Sort(sort.IntSlice(p))
	if !(p[0]+p[1] > p[2] && p[1]+p[2] > p[0] && p[2]+p[0] > p[1]) {
		return Nothing
	}

	c = (p[0] * p[0]) + (p[1] * p[1]) - (p[2] * p[2])
	if c == 0 {
		return RightTriangle
	}
	if c > 0 {
		return SharpTriangle
	}
	return ObtuseTriangle
}

func main() {
	var res = new(result)
	var a, b, c int
	var hasNext = true
	for hasNext {
		fmt.Scanf("%d %d %d", &a, &b, &c)
		switch checkTriangleType(a, b, c) {
		case Nothing:
			hasNext = false
		case RightTriangle:
			res.rTriangle++
		case SharpTriangle:
			res.sTriangle++
		case ObtuseTriangle:
			res.oTriangle++
		}
	}
	fmt.Println(res.String())
}

C++: #include<iostream>
#include<algorithm>

using namespace std;

int main() {
	
	int Length[3];
	int Triangle[4] = {0};
	bool flag = 0;
	
	while( cin >> Length[0] >> Length[1] >> Length[2]) {
	
	sort(Length, Length+3);
	
	if( Length[0] + Length[1] <= Length[2] ) flag = 1;
	if(flag == 1) continue;
	
	if( Length[0] * Length[0] + Length[1] * Length[1] 
	== Length[2] * Length[2] )
	Triangle[1]++;
	
	else if(Length[0] * Length[0] + Length[1] * Length[1] 
	< Length[2] * Length[2] )
	Triangle[2]++;
	
	else
	Triangle[3]++;
	
	Triangle[0]++;
	}

	cout << Triangle[0] << " " << Triangle[1] << " "
		 << Triangle[2] << " " << Triangle[3] << "\n";
	return 0;
}

C++: #include <algorithm>
#include <array>
#include <iostream>

using namespace std;

namespace prob0582 {
	enum TriangleType { DoesNotExist = 0, RightAngle, Accute, Obtuse };

	TriangleType checkTriangleType(array<int, 3> edges)
	{
		int longest = 0;
		int longest2sq = 0;
		int sum = 0;
		int sumsq = 0;

		for (int i = 0; i < 3; ++i) {
			if (edges[i] > longest) longest = edges[i];
			sum += edges[i];
			sumsq += edges[i] * edges[i];
		}
		longest2sq = 2 * longest * longest;

		if (sum <= 2 * longest) return DoesNotExist;
		if (sumsq > longest2sq) return Accute;
		if (sumsq == longest2sq) return RightAngle;
		return Obtuse;
	}

	void solve(istream &sin, ostream &sout)
	{
		int total = 0;
		int eachType[]{ 0,0,0,0 };

		array<int, 3> edges;
		TriangleType type;

		do
		{
			sin >> edges[0] >> edges[1] >> edges[2];
			++total;
			type = checkTriangleType(edges);
			eachType[static_cast<int>(type)]++;
		} while (type != DoesNotExist);
		--total;

		sout << total;
		for (int i = 0; i < 3; ++i) sout << " " << eachType[i + 1];
		sout << endl;
	}
}

int main()
{
	prob0582::solve(cin, cout);
}

C++: #include<iostream>
#include<algorithm>
using namespace std;

int main(){
  int a[3];

  int t,l,v,g;
  t = l = v = g = 0;
  while(cin >> a[0] >> a[1] >> a[2]){
    sort(a,a+3);
    if(a[0]+a[1]<=a[2])cout << t << " " << v << " " << l << " " << g << endl;
    else{
      t++;
      int s = a[0]*a[0]+a[1]*a[1]-a[2]*a[2];
      if(s<0)g++;
      else if(s==0)v++;
      else l++;
    }
  }
}

C++: #include<cstdio>

int partition(int A[], int p, int r){
    int x = A[r];
    int i = p-1;
    for(int j=p; j<r; j++){
        if(A[j]<= x){
            i++;
            int temp = A[i];
            A[i] = A[j];
            A[j] = temp;
        }
    }
    int temp = A[r];
    A[r] = A[i+1];
    A[i+1] = temp;
    return i+1;
}

void quickSort(int A[], int p, int r){
    if(p<r){
        int q = partition(A, p, r);
        quickSort(A, p, q-1);
        quickSort(A, q+1, r);
    }
}

int main(){
    int l[3];
    int cnt[4] ={0};

    while(1){
        for(int i=0; i<3; i++) scanf("%d", &l[i]);
        quickSort(l, 0, 2);
        double a = (double)l[0], b=(double)l[1], c=(double)l[2];

        if(!(a+b>c && b+c>a && c+a>b)) break;
        
        cnt[0]++;
        double cosine = (b*b+a*a-c*c)/(2*b*c);
        if(cosine == 0) cnt[1]++;
        else if(cosine >0) cnt[2]++;
        else cnt[3]++;
    }

    for(int i=0; i<4; i++){
        if(i) printf(" ");
        printf("%d", cnt[i]);
    }
    printf("\n");

    return 0;
}

C++: #include <iostream>
#include <sstream>
#include <string>
#include <algorithm>
#include <vector>
#include <stack>
#include <queue>
#include <set>
#include <map>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <cassert>

using namespace std;

#define FOR(i,k,n) for(int i=(k); i<(int)(n); ++i)
#define REP(i,n) FOR(i,0,n)
#define FORIT(i,c) for(__typeof((c).begin())i=(c).begin();i!=(c).end();++i)

template<class T> void debug(T begin, T end){ for(T i = begin; i != end; ++i) cerr<<*i<<" "; cerr<<endl; }
inline bool valid(int x, int y, int W, int H){ return (x >= 0 && y >= 0 && x < W && y < H); }

typedef long long ll;
const int INF = 100000000;
const double EPS = 1e-8;
const int MOD = 1000000007;
int dx[8] = {1, 0, -1, 0, 1, -1, -1, 1};
int dy[8] = {0, 1, 0, -1, 1, 1, -1, -1};

int main(){
  int a, b, c;
  int ans[4] = {};
  while(cin>>a>>b>>c){
    if(!(c > b - a)) continue;
    if(!(c > a - b)) continue;
    if(!(c < a + b)) continue;
    if(a > b) swap(a, b);
    if(b > c) swap(b, c);
    int D = a * a + b * b  - c * c;
    ans[0]++;
    if(D > 0) ans[1]++;
    if(D == 0) ans[2]++;
    if(D < 0) ans[3]++;
  }
  printf("%d %d %d %d\n", ans[0], ans[2], ans[1], ans[3]);
  return 0;
}

C++: #include<iostream>
#include<algorithm>
#include<map>
using namespace std;
int main() {
	int s=0, t=0, e=0, d=0;
	while (true) {
		int a[3];
		cin >> a[0] >> a[1] >> a[2];
		sort(a, a + 3);
		if (a[0] + a[1] <= a[2]) break;
		long long b = a[0] * a[0] + a[1] * a[1];
		long long c = a[2] * a[2];
		s++;
		if (b == c) t++;
		else if (b < c) d++;
		else e++;
	}
	cout << s << " " << t << " " << e << " " << d << endl;
}

C++: #include<iostream>
#include<string>
#include<algorithm>
 
using namespace std;
 
int main()
{
	int tris = 0;
	int right_tris = 0;
	int acute_tris = 0;
	int obtuse_tris = 0;
	for( int i = 0; i < 100; i ++)
	{
		int a, b, c;
		cin >> a >> b >> c;

		if( a == 0 )
		{
			cout << tris << " " << right_tris << " " << acute_tris << " " << obtuse_tris << endl;
			return 0;
		}

		if( a + b > c && b + c > a && c + a > b )
		{
			tris ++;

			int d = b * b + c * c;
			int aa = a * a;

			if( d == aa )
			{
				right_tris ++;
				continue;
			}
			else if ( d > aa )
			{
				acute_tris ++;
				continue;
			}
			else
			{
				obtuse_tris ++;
				continue;
			}
			d = c * c + a * a;
			aa = b * b;

			if( d == aa )
			{
				right_tris ++;
				continue;
			}
			else if ( d > aa )
			{
				acute_tris ++;
				continue;
			}
			else
			{
				obtuse_tris ++;
				continue;
			}
			d = a * a + b * b;
			aa = c * c;

			if( d == aa )
			{
				right_tris ++;
				continue;
			}
			else if ( d > aa )
			{
				acute_tris ++;
				continue;
			}
			else
			{
				obtuse_tris ++;
				continue;
			}
		}
	}

	return 0;
}

C++: #include<iostream>
#include<algorithm>
#include<cmath>
using namespace std;
int main() {
  int p[3]={},a=0,b=0,c=0,d=0;
  while(cin >> p[0] >> p[1] >> p[2]) {
      sort(p,p+3);
      if(p[0]+p[1]<=p[2]) {
          cout << a << " " << b << " " << c << " " << d << endl;
          return 0;
      }
      a++;
      if(p[0]*p[0]+p[1]*p[1]==p[2]*p[2]) {
          b++;
      }
      else if(p[0]*p[0]+p[1]*p[1]>p[2]*p[2]) {
          c++;
      }
      else if(p[0]*p[0]+p[1]*p[1]<p[2]*p[2]) {
          d++;
      }
  }
}