delete pics to save space

1.2233.cpp

@@ -0,0 +1,44 @@
+#include<cstdio>
+#include<cstring>
+#include<algorithm>
+using namespace std;
+void times(int a[8][8],int b[8][8],int t[8][8])
+{
+	memset(t,0,256);
+	for(int r=0;r<8;r++) for(int c=0;c<8;c++)
+	{
+		for(int k=0;k<8;k++) t[r][c]+=a[r][k]*b[k][c];
+		t[r][c]%=1000;
+	}
+}
+int n;
+int a[8][8]={
+{0,1,0,0,0,0,0,1},
+{1,0,1,0,0,0,0,0},
+{0,1,0,1,0,0,0,0},
+{0,0,1,0,0,0,0,0},
+{0,0,0,1,0,1,0,0},
+{0,0,0,0,0,0,1,0},
+{0,0,0,0,0,1,0,1},
+{1,0,0,0,0,0,1,0}
+},b[8][8],c[8][8];
+void ksm(int a[8][8],int b[8][8],int tmp[8][8],int n)
+{
+	memset(b,0,256);
+	for(int i=0;i<8;i++) b[i][i]=1;
+	for(;n;n>>=1)
+	{
+		if(n&1) { times(b,a,tmp); memcpy(b,tmp,256); }
+		times(a,a,tmp); memcpy(a,tmp,256);
+	}
+}
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	scanf("%d",&n);
+	ksm(a,b,c,n);
+	printf("%d\n",b[4][0]);
+	return 0;
+}