Submission #1113456

#	Time	Username	Problem	Language	Result	Execution time	Memory
1113456		coolsentenceidontremember	Osmosmjerka (COCI17_osmosmjerka)	C++17	160 / 160	1732 ms	154660 KiB

osmosmjerka

/*


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SS,...,,...,SS#;....:??*#*....,S%.....?%;:;;%S,...+#;.,.:#*.,..?@S,....+%?*?#;.,..:S*.....?#%,....*@+...,,::,....?%:,,+S;....:S+:,,:*S:....;%?*S%,...,:::,...:##?....:S+,;S;....:??*+S?.....%#,....%?,..
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*/



#include "bits/stdc++.h"
#define ll long long
#define ld long double
#define ff first
#define ss second
#define pii pair<int, int>
#define mp make_pair

using namespace std;

void setIO(string s = ""){
 ios_base::sync_with_stdio(false);
 cin.tie(nullptr);
 cout.tie(nullptr);
 if (!s.empty()){
	freopen((s+".in").c_str(), "r", stdin);
	freopen((s+".out").c_str(), "w", stdout);
	}
}



struct chash {
	const double PI = acos(-1);
	const uint64_t C = (2e18 * PI)+71;
	const uint32_t random = chrono::steady_clock::now().time_since_epoch().count();
	size_t operator()(ll x) const {
		return __builtin_bswap64((x^random)*C);
	} 
};

const ll M[2] = {1000000009, 1000000007};

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
vector<string> s;
map<pair<ll, ll>, int> cnt;
vector<ll> p[2];
array<ll, 2> B;
void init(){
	p[0].push_back(B[0]);
	p[1].push_back(B[1]);
	for (int i = 1; i <= 32; i++) {
		p[0].push_back(p[0].back()*p[0].back()%M[0]);
		p[1].push_back(p[1].back()*p[1].back()%M[1]);
	}
}

ll hsh[2][31][500][500];

ll concat(ll pre, ll suf, int factor, const int &sign){
	ll ret = pre*p[sign][factor]%M[sign];
	return (ret+suf)%M[sign];
}

void generate(const int &k, const int &dx, const int &dy, const int &n, const int &m){
	memset(hsh, 0, sizeof hsh);
	for (int i = 0; i < n; i++) for (int j = 0; j < m; j++) hsh[0][0][i][j] = hsh[1][0][i][j] = s[i][j];
	
	for (int l = 1; l <= 30; l++){
		for (int i = 0; i < n; i++){
			for (int j = 0; j < m; j++){
				hsh[0][l][i][j] = concat(hsh[0][l-1][i][j], hsh[0][l-1][((i+dx*(1<<(l-1)))%n+n)%n][((j+dy*(1<<(l-1)))%m+m)%m], l-1, 0);
				hsh[1][l][i][j] = concat(hsh[1][l-1][i][j], hsh[1][l-1][((i+dx*(1<<(l-1)))%n+n)%n][((j+dy*(1<<(l-1)))%m+m)%m], l-1, 1);
			}
		}
	}
	for (int i = 0; i < n; i++){
		for (int j = 0; j < m; j++){
			ll cur[2] = {0, 0};
			int cur_x = i, cur_y = j;
			for (int b = 0; b <= 30; b++){
				if (k & (1<<b)){
					cur[0] = concat(cur[0], hsh[0][b][cur_x][cur_y], b, 0);
					cur[1] = concat(cur[1], hsh[1][b][cur_x][cur_y], b, 1);
					cur_x = ((cur_x + dx*(1<<b))%n + n)%n ;
					cur_y = ((cur_y + dy*(1<<b))%m+m)%m;
				}
			}
			cnt[mp(cur[0], cur[1])]++;
		}
	}
}


int main(){
	setIO();
    int n, m, k;
    cin >> n >> m >> k;
    ll same = 0, all = 1LL*n*m*8*n*m*8;
    for (int i = 0; i < n; i++){
    	string ss;
    	cin >> ss;
    	s.push_back(ss);
	}
	B[0] = uniform_int_distribution<int>(0, M[0]-1)(rng);
	B[1] = uniform_int_distribution<int>(0, M[0]-1)(rng);
	init();
    for (int i = -1; i <= 1; i++){
    	for (int j = -1; j <= 1; j++){
    		if (i != 0 || j != 0) generate(k, i, j, n, m);
		}
	}
	for (const auto &x : cnt) same += 1LL*x.ss*x.ss;
	ll g = __gcd(same, all);
	same/=g;
	all/=g;
	cout << same << '/' << all;
}

Compilation message (stderr)

osmosmjerka.cpp: In function 'void setIO(std::string)':
osmosmjerka.cpp:138:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  138 |  freopen((s+".in").c_str(), "r", stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
osmosmjerka.cpp:139:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  139 |  freopen((s+".out").c_str(), "w", stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 160 / 160