#include <bits/stdc++.h>
using namespace std;
#define ull unsigned long long
const int mxN=500, di[8]={0, 1, 1, 1, 0, -1, -1, -1}, dj[8]={-1, -1, 0, 1, 1, 1, 0, -1}, B=29;
int n, m, k;
string g[mxN];
bool vis[mxN][mxN];
ull h[2*mxN*mxN+1], a1, a2, a3, pB=1, c[8*mxN*mxN];
int main() {
ios::sync_with_stdio(0);
cin.tie(0);
cin >> n >> m >> k, k=min(n*m, k);
for(int i=0; i<k; ++i)
pB*=B;
for(int i=0; i<n; ++i)
cin >> g[i];
for(int d=0, e=0; d<8; ++d) {
for(int i=0; i<n; ++i) {
for(int j=0; j<m; ++j) {
if(vis[i][j])
continue;
int a=0;
for(int ci=i, cj=j; !vis[ci][cj]; ci=(ci+di[d]+n)%n, cj=(cj+dj[d]+m)%m) {
vis[ci][cj]=1;
h[++a]=g[ci][cj]-'a'+1;
}
for(int l=a; l+1<a+k; l+=a)
memcpy(h+l+1, h+1, 8*a);
for(int l=1; l<a+k; ++l)
h[l]+=h[l-1]*B;
for(int l=0; l<a; ++l)
c[e++]=h[l+k]-h[l]*pB;
}
}
memset(vis, 0, sizeof(vis));
}
sort(c, c+8*n*m);
for(int i=0, j=0; i<8*n*m; i=j) {
for(; j<8*n*m&&c[j]==c[i]; ++j);
a1+=(ull)(j-i)*(j-i);
}
a2=n*m*8, a2*=a2;
a3=__gcd(a1, a2);
cout << a1/a3 << "/" << a2/a3;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
3 ms |
640 KB |
Output is correct |
| 2 |
Correct |
2 ms |
640 KB |
Output is correct |
| 3 |
Correct |
2 ms |
640 KB |
Output is correct |
| 4 |
Correct |
2 ms |
640 KB |
Output is correct |
| 5 |
Correct |
5 ms |
768 KB |
Output is correct |
| 6 |
Correct |
19 ms |
1280 KB |
Output is correct |
| 7 |
Correct |
272 ms |
5440 KB |
Output is correct |
| 8 |
Correct |
3913 ms |
18660 KB |
Output is correct |
