delete pics to save space

7.1830.cpp

@@ -0,0 +1,42 @@
+#include<cstdio>
+#include<cstring>
+#include<algorithm>
+using namespace std;
+int T,n,res,a[105];
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	scanf("%d",&T);
+	while(T-->0)
+	{
+		scanf("%d",&n);
+		for(int i=1;i<=n;i++) scanf("%d",&a[i]);
+		for(int i=1,j;i<=n;i++)
+		{
+			scanf("%d",&j);
+			a[i]^=j;
+			a[i]|=1<<i; //a[i][i]=1;
+		}
+		int x,y;
+		while(scanf("%d%d",&x,&y)==2&&x&&y) a[y]|=1<<x;//a[y][x]=1;
+		int res=1;
+		for(int i=1;i<=n;i++)
+		{
+			for(int j=i+1;j<=n;j++) if(a[j]>a[i]) swap(a[j],a[i]);
+			if(a[i]==0) { res=1<<(n-i+1); break; }
+			if(a[i]==1) { res=0; break; }
+			for(int k=n;k;k--)
+				if(a[i]>>k&1)
+				{
+					for(int j=1;j<=n;j++)
+						if(i!=j&&(a[j]>>k&1)) a[j]^=a[i];
+					break;
+				}
+		}
+		if(res==0) puts("Oh,it's impossible~!!");
+		else printf("%d\n",res);
+	}
+	return 0;
+}