1411: [ZJOI2009]硬币游戏【xjb找规律

xjb手玩找规律，并发现这个规律很靠谱

然后把操作次数拆成2的次幂之和，完了

#include
#define MAXN 200005
using namespace std;	long long n,T;
inline long long read(){
	register char ch = getchar();
	while(!isdigit(ch))	ch = getchar();
	register long long rtn = 0;
	while(isdigit(ch))	rtn = rtn*10 + ch - '0' , ch = getchar();
	return rtn;
}
int a[MAXN],f[MAXN];

inline void work(long long k , int h){
	for(long long i = h;i<=n;++++i){
		f[i] = 1 ^ a[((i-k)%n+n)%n] ^ a[(i+k)%n];
	}
	f[0] = f[n] , f[n] = 0;
	for(int i = h^1;i<=n;++++i)	f[i] = -1;
	memcpy(a,f,sizeof f);
//	for(int i=h;i<=n;++++i)	printf("%d ",a[i]);	puts("");
}

int main(){
//	freopen("1.in","r",stdin);

	n = read()<<1 , T = read();

	for(int i=1;i<=n;++++i)	a[i] = read()==1;

	for(long long i = 1,bg = 1;i <= T;i<<=1)
		if(T&i)
			work(i,bg = (bg+i)%2);

	for(int i=0;i<=n;++i)
		if(a[i]==-1)	a[i] = 0;
		else	if(a[i]==0)	a[i] = 2;
	for(int i=1;i