Submission #969319

#	Time	Username	Problem	Language	Result	Execution time	Memory
969319		xjonwang	Osmosmjerka (COCI17_osmosmjerka)	C++17	140 / 160	2770 ms	33576 KiB

osmosmjerka

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define ld long double
#define ar array
#define str string

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp> 
using namespace __gnu_pbds;

template <typename T> using oset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

#define vt vector
#define pb push_back
#define all(c) (c).begin(), (c).end()
#define sz(x) (int)(x).size()
#define pll pair<ll, ll>
#define pii pair<int, int>
#define f first
#define s second

#define F_OR(i, a, b, s) for (int i=(a); (s)>0?i<(b):i>(b); i+=(s))
#define F_OR1(e) F_OR(i, 0, e, 1)
#define F_OR2(i, e) F_OR(i, 0, e, 1)
#define F_OR3(i, b, e) F_OR(i, b, e, 1)
#define F_OR4(i, b, e, s) F_OR(i, b, e, s)
#define GET5(a, b, c, d, e, ...) e
#define F_ORC(...) GET5(__VA_ARGS__, F_OR4, F_OR3, F_OR2, F_OR1)
#define FOR(...) F_ORC(__VA_ARGS__)(__VA_ARGS__)
#define EACH(x, a) for (auto& x: a)

#define MOD ((int)1e9+7)

template<class T> bool umin(T& a, const T& b) {
	return b<a?a=b, 1:0;
}
template<class T> bool umax(T& a, const T& b) { 
	return a<b?a=b, 1:0;
} 

ll FIRSTTRUE(function<bool(ll)> f, ll lb, ll rb) {
	while(lb<rb) {
		ll mb=(lb+rb)/2;
		f(mb)?rb=mb:lb=mb+1; 
	} 
	return lb;
}
ll LASTTRUE(function<bool(ll)> f, ll lb, ll rb) {
	while(lb<rb) {
		ll mb=(lb+rb+1)/2;
		f(mb)?lb=mb:rb=mb-1; 
	} 
	return lb;
}

template<class A> void read(vt<A>& v);
template<class A, size_t S> void read(ar<A, S>& a);
template<class A, class B> void read(pair<A, B>& x);
template<class T> void read(T& x) {
	cin >> x;
}
void read(double& d) {
	string t;
	read(t);
	d=stod(t);
}
void read(long double& d) {
	string t;
	read(t);
	d=stold(t);
}
template<class H, class... T> void read(H& h, T&... t) {
	read(h);
	read(t...);
}
template<class A> void read(vt<A>& x) {
	EACH(a, x)
		read(a);
}
template<class A, size_t S> void read(array<A, S>& x) {
	EACH(a, x)
		read(a);
}
template<class A, class B> void read(pair<A, B>& x) {
	cin >> x.first >> x.second;
}


string to_string(char c) {
	return string(1, c);
}
string to_string(bool b) {
	return b?"true":"false";
}
string to_string(const char* s) {
	return string(s);
}
string to_string(string s) {
	return s;
}
string to_string(vt<bool> v) {
	string res;
	FOR(sz(v))
		res+=char('0'+v[i]);
	return res;
}

template<size_t S> string to_string(bitset<S> b) {
	string res;
	FOR(S)
		res+=char('0'+b[i]);
	return res;
}
template<class T> string to_string(T v) {
    bool f=1;
    string res;
    EACH(x, v) {
		if(!f)
			res+=' ';
		f=0;
		res+=to_string(x);
	}
    return res;
}
template<class A, class B> string to_string(pair<A, B>& x) {
	return to_string(x.first) + ' ' + to_string(x.second);
}

template<class A> void write(A x) {
	cout << to_string(x);
}
template<class H, class... T> void write(const H& h, const T&... t) { 
	write(h);
	write(t...);
}
void print() {
	write("\n");
}
template<class H, class... T> void print(const H& h, const T&... t) { 
	write(h);
	if(sizeof...(t))
		write(' ');
	print(t...);
}

mt19937 rng((uint32_t)chrono::steady_clock::now().time_since_epoch().count()); 

using H = ar<int,2>; // bases not too close to ends 
H makeH(char c) { return {c,c}; }
uniform_int_distribution<int> BDIST(0.1*MOD,0.9*MOD);
const H base{BDIST(rng),BDIST(rng)};
H operator+(H l, H r) { 
	FOR(2) if ((l[i] += r[i]) >= MOD) l[i] -= MOD;
	return l; }
H operator-(H l, H r) { 
	FOR(2) if ((l[i] -= r[i]) < 0) l[i] += MOD;
	return l; }
H operator*(H l, H r) { 
	FOR(2) l[i] = (ll)l[i]*r[i]%MOD;
	return l; }

vt<H> pows{{1,1}};

struct HashRange {
	str S; vt<H> cum{{}};
	void add(char c) { S += c; cum.pb(base*cum.back()+makeH(c)); }
	void add(str s) { EACH(c,s) add(c); }
	void extend(int len) { while (sz(pows) <= len) 
		pows.pb(base*pows.back()); }
	H hash(int l, int r) { int len = r+1-l; extend(len);
		return cum[r+1]-pows[len]*cum[l]; }
};

int dc[4]={1, 1, -1, -1}, dr[4]={1, -1, 1, -1};

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	ll n, m, k; read(n, m, k);
	ll mi=min(n, m);
	vt<string> v(n); read(v);
	map<H, ll> cnt;
	umin(k, n*m/gcd(n, m));
	FOR(n) {
		HashRange hr1;
		FOR(j, k+m) hr1.add(v[i][j%m]);
		FOR(j, m) cnt[hr1.hash(j, j+k-1)]++;
		HashRange hr2;
		FOR(j, k+m) hr2.add(v[i][m-1-j%m]);
		FOR(j, m) cnt[hr2.hash(j, j+k-1)]++;
	}
	FOR(m) {
		HashRange hr1;
		FOR(j, k+n) hr1.add(v[j%n][i]);
		FOR(j, n) cnt[hr1.hash(j, j+k-1)]++;
		HashRange hr2;
		FOR(j, k+n) hr2.add(v[n-1-j%n][i]);
		FOR(j, n) cnt[hr2.hash(j, j+k-1)]++;
		FOR(h, 4) {
			HashRange hr;
			FOR(j, k+mi) hr.add(v[((j*dr[h])%n+n)%n][((i+j*dc[h])%m+m)%m]);
			FOR(j, mi) cnt[hr.hash(j, j+k-1)]++;
		}
	}
	ll num=0, denom=m*m*n*n*64;
	for (auto [k, v] : cnt) num+=v*v;
	cout << num/gcd(num, denom) << "/" << denom/gcd(num, denom) << endl;
}

• Subtask 1: 140 / 160