Submission #870784

#	Time	Username	Problem	Language	Result	Execution time	Memory
870784		vjudge1	Osmosmjerka (COCI17_osmosmjerka)	C++17	140 / 160	4006 ms	19840 KiB

osmosmjerka

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#include <bits/stdc++.h>
#pragma GCC optimize(2)
using namespace std;
#define N 501
int di[8]={0, 1, 1, 1, 0, -1, -1, -1}, dj[8]={-1, -1, 0, 1, 1, 1, 0, -1};
int n, m, k;
string g[N];
bool vis[N][N];
unsigned long long h[2*N*N+1], a1, a2, a3, pB=1, c[8*N*N], cnt;
int main() {
	cin.sync_with_stdio(0);
	cin.tie(0);
	cin >> n >> m >> k, k=min(n*m, k);
	for(int i=0; i<k; ++i)
		pB*=29;
	for(int i=0; i<n; ++i)
		cin >> g[i];
    for(int d=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, ci=i, cj=j; 
				while(!vis[ci][cj]) {
					vis[ci][cj]=1;
					h[++a]=g[ci][cj]-'a'+1;
				    ci=(ci+di[d]+n)%n;
				    cj=(cj+dj[d]+m)%m;
				}
				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]*29;
				for(int l=0; l<a; ++l)
					c[cnt++]=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) {
		while (j<8*n*m&&c[j]==c[i])
		    j++;
		a1+=(unsigned long long)(j-i)*(j-i);
	}
	a2=n*m*8, a2*=a2;
	cout << a1/gcd(a1,a2) << "/" << a2/gcd(a1,a2);
}

• Subtask 1: 140 / 160