【POJ 1703】 Find them,Catch them

#include <algorithm>  
#include <bitset>  
#include <cctype>  
#include <cerrno>  
#include <clocale>  
#include <cmath>  
#include <complex>  
#include <cstdio>  
#include <cstdlib>  
#include <cstring>  
#include <ctime>  
#include <deque>  
#include <exception>  
#include <fstream>  
#include <functional>  
#include <limits>  
#include <list>  
#include <map>  
#include <iomanip>  
#include <ios>  
#include <iosfwd>  
#include <iostream>  
#include <istream>  
#include <ostream>  
#include <queue>  
#include <set>  
#include <sstream>  
#include <stdexcept>  
#include <streambuf>  
#include <string>  
#include <utility>  
#include <vector>  
#include <cwchar>  
#include <cwctype>  
#include <stack>  
#include <limits.h> 
using namespace std;
const int MAXN = 1e5 + 10;

int i,T,x,y,n,m;
int fa[MAXN<<1];
char opt[5];

inline int get_root(int x)
{
        if (fa[x] == x) return x;
        return fa[x] = get_root(fa[x]);
}

int main() 
{
        
        scanf("%d",&T);
      while (T--)
      {
              scanf("%d%d",&n,&m);
                for (i = 1; i <= 2 * n; i++) fa[i] = i;
                for (i = 1; i <= m; i++)
                {
                        scanf("%s",&opt);
                        if (opt[0] == ‘A‘)
                        {
                                scanf("%d%d",&x,&y);
                                if (get_root(x) == get_root(y)) printf("In the same gang.\n");
                                else if (get_root(x+n) == get_root(y)) printf("In different gangs.\n");
                                else printf("Not sure yet.\n");        
                        }    else
                        {
                                scanf("%d%d",&x,&y);
                                fa[get_root(x+n)] = get_root(y);
                                fa[get_root(y+n)] = get_root(x);
                        }
                }        
        }
        
        return 0;
    
}