HDU 1730 类NIM模型

两者间的间距就是可取石子数，因为对于行内黑白相连的局面该子游戏已经结束了
因为此时不管先手再怎么移都是必败，SG=0的终止态

/** @Date    : 2017-10-14 21:46:21
  * @FileName: HDU 1730 NIM模型.cpp
  * @Platform: Windows
  * @Author  : Lweleth (SoungEarlf@gmail.com)
  * @Link    : https://github.com/
  * @Version : $Id$
  */
#include <bits/stdc++.h>
#define LL long long
#define PII pair
#define MP(x, y) make_pair((x),(y))
#define fi first
#define se second
#define PB(x) push_back((x))
#define MMG(x) memset((x), -1,sizeof(x))
#define MMF(x) memset((x),0,sizeof(x))
#define MMI(x) memset((x), INF, sizeof(x))
using namespace std;

const int INF = 0x3f3f3f3f;
const int N = 1e5+20;
const double eps = 1e-8;


int main()
{
	int n, m;
	while(cin >> n >> m)
	{
		int sg = 0;
		int a, b;
		for(int i = 0; i < n; i++)
			scanf("%d%d", &a, &b), sg ^= abs(a - b) - 1;
		printf("%s
", sg?"I WIN!":"BAD LUCK!");
	}
    return 0;
}