Go: package main

import (
	"bufio"
	"os"
	"strings"
	"strconv"
	"sort"
	"fmt"
)

var scanner = bufio.NewScanner(os.Stdin)

func main() {
	for scanner.Scan() {
		input := strings.Split(scanner.Text(), ",")
		cards := make([]int, 5)
		for i :=range input {
			cards[i], _ = strconv.Atoi(input[i])
		}
		sort.Sort(sort.IntSlice(cards))
		if cards[0] == cards[1] && cards[2] == cards[3] && cards[2] == cards[1] {
			fmt.Println("four card")
		} else if cards[1] == cards[2] && cards[3] == cards[4] && cards[3] == cards[2]{
			fmt.Println("four card")
		} else if cards[0] == cards[1] && cards[1] == cards[2] && cards[3] == cards[4] {
			fmt.Println("full house")
		} else if cards[0] == cards[1] && cards[2] == cards[3] && cards[3] == cards[4] {
			fmt.Println("full house")
		} else if cards[0] == 1 && cards[1] == 10 && cards[2] == 11 && cards[3] == 12 && cards[4] == 13 {
			fmt.Println("straight")
		} else if cards[0]+1 == cards[1] && cards[1]+1 == cards[2] && cards[2]+1 == cards[3] && cards[3]+1 == cards[4] {
			fmt.Println("straight")
		} else if (cards[0] == cards[1] && cards[1] == cards[2]) || (cards[1] == cards[2] && cards[2] == cards[3]) || (cards[2] == cards[3] && cards[3] == cards[4]) {
			fmt.Println("three card")
		} else if ((cards[0] == cards[1]) && ((cards[2] == cards[3]) || (cards[3] == cards[4]))) || ((cards[1] == cards[2]) && (cards[3] == cards[4])) {
			fmt.Println("two pair")
		} else if cards[0] == cards[1] || cards[1] == cards[2] || cards[2] == cards[3] || cards[3] == cards[4] {
			fmt.Println("one pair")
		} else {
			fmt.Println("null")
		}
	}
}

C++: #include<iostream>
#include<cstdio>
#include<algorithm>
using namespace std;
int main(void){
 
    int a[5]={0};
    string str="null";
    while(scanf("%d,%d,%d,%d,%d",&a[0],&a[1],&a[2],&a[3],&a[4])!=EOF){
        sort(a,a+5);
        if(((a[0]==a[1])&&(a[2]==a[3])&&(a[2]==a[1]))||((a[1]==a[2])&&(a[2]==a[3])&&(a[3]==a[4])))str="four card";
        else if(((a[0]==a[1])&&(a[1]==a[2])&&(a[3]==a[4]))||((a[0]==a[1])&&(a[2]==a[3])&&(a[3]==a[4])))str="full house";
        else if(((a[0]==1)&&(a[1]==10)&&(a[2]==11)&&(a[3]==12)&&(a[4]==13))||((a[0]+1==a[1])&&(a[1]+1==a[2])&&(a[2]+1==a[3])&&(a[3]+1==a[4])))str="straight";
        else if(((a[0]==a[1])&&(a[1]==a[2]))||((a[1]==a[2])&&(a[2]==a[3]))||((a[2]==a[3])&&(a[3]==a[4])))str="three card";
        else if(((a[0]==a[1])&&((a[2]==a[3])||(a[3]==a[4])))||((a[1]==a[2])&&(a[3]==a[4])))str="two pair";
        else if((a[0]==a[1])||(a[1]==a[2])||(a[2]==a[3])||(a[3]==a[4]))str="one pair";
 
        cout<<str<<endl;
    }
    return 0;
}

C++: #include <bits/stdc++.h>

#define SIZE 300005
#define MOD 1000000007LL
#define INF INT_MAX / 3
#define LLINF 1LL << 60
#define REP(i,n) for(int i=0;i<n;i++)
#define FOR(i,a,b) for(int i=a;i<=b;i++)
#define DOWN(i,b,a) for(int i=b;i>=a;i--)
#define SET(a,c) memset(a,c,sizeof a)
#define FORALL(i,c) for(__typeof((c).begin())i=(c).begin();i!=(c).end();++i)
#define FOREACH(i,c) for(auto (i) : (c))
#define BIT(i,j) ((i)>>(j))&1
#define ALL(o) (o).begin(), (o).end()
#define ERASE(o) (o).erase(unique((o).begin(),(o).end()), (o).end())
#define SQ(x) ((x)*(x))
using namespace std;
typedef long long ll;
typedef valarray<int> Array;
typedef pair<ll,ll> Pll;
typedef pair<int, int> Pii;
typedef pair<double, double> Pdd;
template<typename T> inline void priv(vector<T>a){REP(i,a.size()){cout<<a[i];if(i==a.size()-1)cout<<endl;else cout<<" ";}}
int gcd(int a,int b){int c=max(a,b);int d=min(a,b);return c==0||d==0?c:gcd(c%d,d);}
int lcm(int a,int b){return a==0||b==0?0:a*b/gcd(a,b);}

void solve(int a1, int a2, int a3, int a4, int a5)
{
  int a[13]; fill_n(a,13,0);
  a[--a1]++;a[--a2]++;a[--a3]++;a[--a4]++;a[--a5]++;
  int m = 0; bool f = false;
  vector<int> s;
  string ans;
  REP(i,13)
  {
    m = max(a[i],m);
    if(a[i]>0)
    {
      s.push_back(a[i]);
      if(i < 10)
      {
        bool flag = true;
        REP(j,5) if(a[(i+j)%13] == 0)
        {
          flag = false;
          break;
        }
        f = f || flag;
      }
    }
  }
  if(m >= 4) ans = "four card";
  else if(s.size()==2) ans = "full house";
  else if(f) ans = "straight";
  else
  {
    int b[3]; fill_n(b,3,0);
    REP(i,s.size()) b[s[i]-1]++;
    if(b[2] > 0) ans = "three card";
    else if(b[1] > 1) ans = "two pair";
    else if(b[1] > 0) ans = "one pair";
    else ans = "null";
  }
  printf("%s\n",ans.c_str());
}

int main()
{
  cin.tie(0);
  ios::sync_with_stdio(false);
  int a,b,c,d,e;
  while(~scanf("%d,%d,%d,%d,%d",&a,&b,&c,&d,&e))
    solve(a,b,c,d,e);
  return 0;
}

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

int main()
{
	int n; char c; string s;
	while(cin >> n)
	{
		int cd[13]={0},pr[5]={0};

		cd[n-1]++;
		for(int i=0; i<4; i++)
		{
			cin >> c >> n;
			cd[n-1]++;
		}

		for(int i=0; i<13; i++)
		{
			pr[cd[i]]++;
		}

		bool st=false;
		for(int i=0; i<10; i++)
		{
			int sm=0;
			for(int j=0; j<5; j++) sm+=(cd[(i+j)%13]?1:0);
			if(sm==5) st=true;
		}

		                      s="null";
		     if(pr[4])        s="four card";
		else if(pr[3]&&pr[2]) s="full house";
		else if(st)           s="straight";
		else if(pr[3])        s="three card";
		else if(pr[2]==2)     s="two pair";
		else if(pr[2])        s="one pair";

		cout << s << endl;
	}
}