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union-find sets poj 1703 find them, catch them 帮派之争

Find them, Catch them

Sample Input

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1
5 5
A 1 2
D 1 2
A 1 2
D 2 4
A 1 4

Sample Output

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2
3
Not sure yet.
In different gangs.
In the same gang.

Code

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#include <iostream>  
#include <string>
#include <cstring>
#include <cstdlib>
#include <cstdio>
#include <cmath>
#include <vector>
#include <stack>
#include <deque>
#include <queue>
#include <bitset>
#include <list>
#include <map>
#include <set>
#include <iterator>
#include <algorithm>
#include <functional>
#include <utility>
#include <sstream>
#include <climits>
#include <cassert>
#define MID(x,y) ( ( x + y ) >> 1 )
#define L(x) ( x << 1 )
#define R(x) ( x << 1 | 1 )
#define BUG puts("here!!!");
#define STOP system("pause");

using namespace std;
const int N = 100005;
int f[N+N];
int n, m;
int find(int x) {
if(f[x] < 0) return x;
return f[x] = find(f[x]);
}
int main() {
int loop;
cin >> loop;
while(loop--) {
scanf("%d%d", &n, &m);
memset(f, 255, sizeof(f));
while(m--) {
int a, b;
char s[3];
scanf("%s%d%d", s, &a, &b);
if(s[0] == 'A') {
if(find(a) != find(b) && find(a) != find(b+n)) {
printf("Not sure yet.\n");
}
else if(find(a) == find(b)) {
printf("In the same gang.\n");
}
else printf("In different gangs.\n");
}
else {
if(find(a) != find(b+n)) {
f[find(a)] = find(b+n);
f[find(b)] = find(a+n);
}
}
}
}
return 0;
}