Submission #1191466

#	Time	Username	Problem	Language	Result	Execution time	Memory
1191466		SmuggingSpun	Sateliti (COCI20_satellti)	C++20	110 / 110	426 ms	17564 KiB

Main

#include<bits/stdc++.h>
#define taskname "C"
using namespace std;
template<class T>void minimize(T& a, T b){
	if(a > b){
		a = b;
	}
}
int n, m;
namespace sub1{
	void solve(){
		vector<string>a(n);
		for(string& s : a){
			cin >> s;
		}		
		vector<string>ans = a;
		for(int i = 0; i < n; i++){
			for(int j = 0; j < m; j++){
				vector<string>b;
				for(int k = i; k < n; k++){
					b.emplace_back(a[k].substr(j, m - j) + a[k].substr(0, j));
				}
				for(int k = 0; k < i; k++){
					b.emplace_back(a[k].substr(j, m - j) + a[k].substr(0, j));
				}
				minimize(ans, b);
			}
		}
		for(string& s : ans){
			cout << s << "\n";
		}
	}
}
namespace sub23{
	const int lim = 2e3 + 5;
	const int mod = 1e9 + 9;
	void add(int& a, int b){
		if((a += b) >= mod){
			a -= mod;
		}
	}
	int power(int a, int b){
		int ans = 1;
		for(; b > 0; b >>= 1, a = 1LL * a * a % mod){
			if(b & 1){
				ans = 1LL * ans * a % mod;
			}
		}
		return ans;
	}
	int pw_row[lim], pw_col[lim], inv_row[lim], inv_col[lim], hash_v[lim][lim];
	bitset<lim>a[lim];
	int get_hash(int x, int y, int u, int v){
		return 1LL * (((hash_v[u][v] - hash_v[x - 1][v] - hash_v[u][y - 1] + hash_v[x - 1][y - 1]) % mod + mod) % mod) * inv_row[x - 1] % mod * inv_col[y - 1] % mod;
	}
	void solve(){
		for(int i = 0; i < lim; i++){
			a[i].reset();
		}
		for(int i = pw_row[0] = pw_col[0] = inv_row[0] = inv_col[0] = 1; i < lim; i++){
			pw_row[i] = (pw_row[i - 1] << 1) % mod;
			pw_col[i] = 3LL * pw_col[i - 1] % mod;
		}
		inv_row[lim - 1] = power(pw_row[lim - 1], mod - 2);
		inv_col[lim - 1] = power(pw_col[lim - 1], mod - 2);
		for(int i = lim - 2; i > 0; i--){
			inv_row[i] = (inv_row[i + 1] << 1) % mod;
			inv_col[i] = 3LL * inv_col[i + 1] % mod;
		}
		for(int i = 1; i <= n; i++){
			for(int j = 1; j <= m; j++){
				char c;
				cin >> c;
				if(c == '.'){
					a[i].set(j);
					a[i].set(j + m);
					a[i + n].set(j);
					a[i + n].set(j + m);
				}
			}
		}
		memset(hash_v, 0, sizeof(hash_v));
		for(int i = 1; i <= (n << 1); i++){
			for(int j = 1, sum = 0; j <= (m << 1); j++){
				if(a[i].test(j)){
					add(sum, 1LL * pw_row[i] * pw_col[j] % mod);
				}
				hash_v[i][j] = (hash_v[i - 1][j] + sum) % mod;
			}
		}
		int x = 1, y = 1;
		for(int i = 1; i <= n; i++){
			for(int j = 1; j <= m; j++){
				int low = 0, high = n - 1, p = 0;
				while(low <= high){
					int mid = (low + high) >> 1;
					if(get_hash(i, j, i + mid, j + m - 1) == get_hash(x, y, x + mid, y + m - 1)){
						low = p = mid + 1;
					}
					else{
						high = mid - 1;
					}
				}
				if(p < n){
					int pp = high = m - 1;
					low = 0;
					while(low <= high){
						int mid = (low + high) >> 1;
						if(get_hash(i + p, j, i + p, j + mid) != get_hash(x + p, y, x + p, y + mid)){
							high = (pp = mid) - 1;
						}
						else{
							low = mid + 1;
						}
					}
					if(!a[i + p].test(j + pp)){
						x = i;
						y = j;
					}
				}
			}
		}
		for(int i = 0; i < n; i++){
			for(int j = 0; j < m; j++){
				cout << (a[i + x].test(j + y) ? '.' : '*');
			}
			cout << "\n";
		}
	}
}
int main(){
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	if(fopen(taskname".inp", "r")){
		freopen(taskname".inp", "r", stdin);
	}
	cin >> n >> m;
	if(max(n, m) <= 50){
		sub23::solve();
	}
	else{
		sub23::solve();
	}
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:134:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  134 |                 freopen(taskname".inp", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 40 / 40
• Subtask 3: 60 / 60